Even more acute was his letter to the Public Advertiser on a proposed Act to prevent emigration from England. Such an Act, he declared, was unnecessary, impracticable, impolitic and unjust. What is more, with an insight into the laws governing population, superior to that of any man of his time, he made his assertions good. To illustrate this claim in part, we need go no further than what he had to say about the necessity of the Act.

As long as the new situation shall be far preferable to the old [he said], the emigration may possibly continue. But when many of those, who at home interfered with others of the same rank (in the competition for farms, shops, business, offices, and other means of subsistence), are gradually withdrawn, the inconvenience of that competition ceases; the number remaining no longer half starve each other; they find they can now subsist comfortably, and though perhaps not quite so well as those who have left them, yet, the inbred attachment to a native country is sufficient to overbalance a moderate difference; and thus the emigration ceases naturally. The waters of the ocean may move in currents from one quarter of the globe to another, as they happen in some places to be accumulated, and in others diminished; but no law, beyond the law of gravity, is necessary to prevent their abandoning any coast entirely. Thus the different degrees of happiness of different countries and situations find, or rather make, their level by the flowing of people from one to another; and where that level is once found, the removals cease. Add to this, that even a real deficiency of people in any country, occasioned by a wasting war or pestilence, is speedily supplied by earlier and more prolific marriages, encouraged by the greater facility of obtaining the means of subsistence. So that a country half depopulated would soon be repeopled, till the means of subsistence were equalled by the population. All increase beyond that point must perish, or flow off into more favourable situations. Such overflowings there have been of mankind in all ages, or we should not now have had so many nations. But to apprehend absolute depopulation from that cause, and call for a law to prevent it, is calling for a law to stop the Thames, lest its waters, by what leave it daily at Gravesend, should be quite exhausted.

Twenty-three years before he had stated the same truths more sententiously in his essay on the Increase of Mankind.

In fine [he said in that essay] a Nation well regulated is like a Polypus; take away a Limb, its Place is soon supply'd; cut it in two, and each deficient Part shall speedily grow out of the Part remaining. Thus if you have Room and Subsistence enough, as you may by dividing, make ten Polypes out of one, you may of one make ten Nations, equally populous and powerful; or rather increase a Nation ten fold in Numbers and Strength.

Franklin clearly saw that, with the increase of population in the colonies, the demand for British manufactures would increase pari passu, and that, with the increased demand for them, the population of Great Britain would increase, perhaps, tenfold. Much as he made of the economic conditions that tended to give a purely agricultural direction to the energies of America, he laughed to scorn the idea that America would always remain in a state of industrial subjection to England.

Only consider the rate of our Increase [he wrote to Peter Collinson, after stating that it was folly to expect that America would always be supplied with cloth by England] and tell me if you can increase your Wooll in that Proportion, and where, in your little Island you can feed the Sheep. Nature has put Bounds to your Abilities, tho' none to your Desires. Britain would, if she could, manufacture & trade for all the World; England for all Britain;—London for all England;—and every Londoner for all London. So selfish is the human Mind! But 'tis well there is One above that rules these Matters with a more equal Hand.

The agency that Franklin held for Pennsylvania in the first instance, and the agencies that he afterwards held for Massachusetts, New Jersey and Georgia, too, afforded him a solid standing for influencing public opinion both in England and America. He was actually in England, and, at the same time, in incessant correspondence with the popular leaders in America. With the beginning of the agitation for the repeal of the Stamp Act he entered upon a course of political activity which added greatly, in another form, to the reputation already acquired by him as a man of science. For his services in securing the repeal, including the flood of light that his answers, when examined before the House of Commons, shed upon the points at issue between the two countries, he was repaid by the English Ministry with attentions which he describes by a term as strong as "caress." Even when the dust of the conflict had thickened, and popular sentiment in England had ranged itself more and more on the side of the King and Parliament, his advice was still eagerly sought by Chatham, Camden, Shelburne and Burke and other liberal and sagacious English statesmen, when they were vainly striving in opposition to restore sanity to the distracted counsels that were menacing the security of the Empire.[20] Those must have been proud moments for Franklin, when the elder Pitt, whom he had come to regard in the earlier stages of his maturer life in England as an "inaccessible," received him as an honored guest under his roof at Hayes, or conferred with him at No. 7 Craven Street, or delivered him to the doorkeepers in the House of Lords, saying aloud, "This is Dr. Franklin, whom I would have admitted into the House." There have been few men who might not have envied the privilege of intimate communion with a man not greater, when he was making his country the mistress of the world, than, when decrepit, and in a hopeless minority, he rose in the House of Lords to plead with a voice, inspired not only by his own matchless eloquence but by all that was best in the history and temper of England for the removal of His Majesty's troops from the town of Boston. On the other side of the Atlantic, too, as the final catastrophe drew nearer, Franklin acquired a position, as the champion of the Colonies, which led Governor Hutchinson of Massachusetts to say of the memorable report, made by a committee to the town meeting, held in Boston on November 20, 1772, that "although at its first appearance it was considered as their own work, yet they had little more to do than to make the necessary alterations in the arrangement of materials prepared for them by their great director in England, whose counsels they obeyed, and in whose wisdom and dexterity they had an implicit faith."

And with entire truth it can be said that, until war became inevitable, Franklin used his influence in both countries with the unwavering purpose of promoting the best interests of both. The representation of America in Parliament at that time he saw was impracticable, and it is hard to believe, though the imbecility of a government without a sanction had not yet been forced upon his attention by the Articles of Confederation, that so practical a man could have had much faith in the steady efficacy of mere requisitions for aids by the Crown on the colonial assemblies. But, within the limits set him by the insurmountable barriers of the hour, it can not be doubted, bold as such an assertion may be, that the wisest thing that both England and the Colonies could have done, if such an idea is conceivable, would have been to leave the controversy between them to his sole arbitration. The most striking tribute that can be paid to the wisdom and open-mindedness of Franklin is to say that, if this had been done, an accommodation would unquestionably have been reached with due regard to the honor, dignity and essential interests of both countries. His attitude in England was that of a loyal friend to both parties to the controversy, who, as he viewed it, had no cause for disagreement that a temperate and sensible man would not know how to readily remove. To the British public he addressed with numerous variations the following arguments: Notwithstanding the rapid increase of population in America, its area was so vast, and contained so much vacant land, that even such artisans as it had soon drifted into the possession and cultivation of land. The danger, therefore, of industrial competition between the two countries was very remote. The people of America, however, would multiply so rapidly that, in the course of a brief time, the demand for manufactures would increase to such an extent that Great Britain would be powerless alone to supply it. He had satisfied himself by an inspection of the cloth factories in Yorkshire that, with a population doubling as did that of America every twenty-five years, Great Britain would in the future be unable to keep the Americans clothed. It was not right that the interests of a particular class of British merchants, tradesmen or artificers should outweigh those of all the King's subjects in the Colonies. Iron was to be found everywhere in America, and beaver furs were the natural productions of that country; hats, nails and steel were wanted there as well as in England. It was of no importance to the common welfare of the empire whether a subject of the King got his living by making hats on one or the other side of the water, whether he grew rich on the Thames or the Ohio, in Edinburgh or Dublin. Yet the hatters of England had obtained an act in their own favor, restraining that manufacture in America in order to oblige the Americans to send their beaver to England to be manufactured, and to purchase back the hats loaded with the charges of a double transportation. In the same manner, had a few nail-makers and a still smaller body of steel-makers (perhaps there were not a half-dozen of these in England) been able to totally forbid by an Act of Parliament the erecting of slitting mills or steel-furnaces in America. All money made by America in trade, or derived by it from fisheries, the produce of the soil or commerce, finally centred in England; yet, though America was drained of all its specie in the purchase of English goods, often mere luxuries and superfluities, she was not even allowed to issue paper money, however carefully safeguarded, to take its place. The idea that the numerous and separate colonies might become dangerous to the mother country was visionary. They were so jealous of each other that they had been wholly unable to agree upon a union for their common defence or to unite in requesting the mother country to establish one for them. The truth was that they loved England much more than they loved each other. There remained among them so much respect, veneration and affection for Britain, that, if cultivated prudently, with kind usage, and tenderness for their privileges, they might be easily governed still for ages, without force, or any considerable expense. Parliament had no constitutional right to levy a direct tax of any kind on America. The King was the only bond between America and Great Britain. In the beginning, no claim had been made by Parliament of a right to even regulate American commerce, but the power had long been exercised by it without any objection on the part of the colonies, and could, at any rate, be reasonably defended on the ground that Great Britain was put to a great expense in policing the seas over which American commerce moved. If England felt that she could not rely upon the voluntary grants of America, to defray the charges imposed upon her by America, then the logical and proper thing to do before she levied direct taxes upon America was to provide for the representation of the Colonies in Parliament. Until that was done, if it was practicable to do it, she should confine herself to the old constitutional practice of requisitions for pecuniary aid, issued by the Secretary of State, at the instance of the Crown, to the Legislative Assemblies of America. These requisitions of a gracious King had been freely honored in the past. Indeed, the pecuniary burden of the wars, which had been carried on in America, though they were not of her kindling, had been borne by America in a larger proportion to her means than England. But to impose a stamp or tea duty upon America by Act of Parliament was simple madness. No taxes of that sort would ever be collected in America except such as were stained with blood. If Parliament, in which America was not represented, had the right to take from her a penny in a pound, what was there to hinder it from calling, whenever it pleased, for the other nineteen shillings and eleven pence? The only result of a continued attempt to tax America would be the complete loss of her respect and affection, and all the political and commercial advantages that accompanied them. It was a mistake to heed the statements of the Colonial Governors as to the limited extent of popular disaffection in America and the inability of the Colonies to dispense with English manufactures. Their dependence was such as to render them more eager to conciliate court than colonial favor. It was also a mistake to suppose that America could not either make or forego any articles whatsoever that she was in the habit of buying from England. Men would tax themselves as heavily to gratify their resentment as their pride. The Americans had resolved to wear no more mourning, and it was now totally out of fashion with near two millions of people. They had resolved to eat no more lamb, and not a joint of lamb had since been seen on any of their tables, but the lambs themselves were all alive with the prettiest of fleeces on their backs imaginable. Look, too, at the pitiful sum of eighty pounds which was all that the odious tea duty banned by America had produced in a year to defray the expense of some hundreds of thousands of pounds incurred by England in maintaining armed ships and soldiers to support the innumerable officeholders charged with the duty of enforcing the tax.

The argument addressed by Franklin to America was equally earnest. The protection that England could afford her, the office of umpire that England could perform for her, in case of disputes between the Colonies, so that they could go on without interruption with their improvements, and increase their numbers, were the advantages that America enjoyed in her connection with England.

By the Exercise of prudent Moderation on her part, mix'd with a little Kindness [Franklin wrote to Thomas Cushing], and by a decent Behaviour on ours, excusing where we can excuse from a Consideration of Circumstances, and bearing a little with the Infirmities of her Government, as we would with those of an aged Parent,[21] tho' firmly asserting our Privileges, and declaring that we mean at a proper time to vindicate them, this advantageous Union may still be long continued. We wish it, and we may endeavour it; but God will order it as to His Wisdom shall seem most suitable. The Friends of Liberty here, wish we may long preserve it on our side the Water, that they may find it there if adverse Events should destroy it here. They are therefore anxious and afraid, lest we should hazard it by premature Attempts in its favour. They think we may risque much by violent Measures and that the Risque is unnecessary, since a little Time must infallibly bring us all we demand or desire, and bring it us in Peace and Safety. I do not presume to advise. There are many wiser men among you, and I hope you will be directed by a still superior Wisdom.