Thus Franklin collected his facts, taking them far and near, and from anybody and everybody. By dint of observation and reflection he finally solved the problem, arriving at the conclusion that "the wind blowing over water thus covered with a film of oil, cannot easily catch upon it, so as to raise the first wrinkles, but slides over it, and leaves it smooth as it finds it."
Another remarkable instance of Franklin's passion for investigation is afforded in the following interesting letter to Sir John Pringle: "When we were travelling together in Holland, you remarked that the canal boat in one of the stages went slower than usual, and inquired of the boatman what might be the reason; who answered that it had been a dry season, and the water in the canal was low. On being asked if it was so low that the boat touched the muddy bottom, he said no, not so low as that, but so low as to make it harder for the horse to draw the boat. We neither of us at first could conceive that, if there was water enough for the boat to swim clear of the bottom, its being deeper would make any difference. But as the man affirmed it seriously as a thing well known among them, and as the punctuality required in their stages was likely to make such difference, if any there were, more readily observed by them than by other watermen who did not pass so regularly and constantly backwards and forwards in the same track, I began to apprehend there might be something in it, and attempted to account for it from this consideration, that the boat in proceeding along the canal must, in every boat's length of her course, move out of her way a body of water equal in bulk to the room her bottom took up in the water; that the water so moved must pass on each side of her, and under her bottom, to get behind her; that if the passage under her bottom was straitened by the shallows, more of the water must pass by her sides, and with a swifter motion, which would retard her, as moving the contrary way; or that, the water becoming lower behind the boat than before, she was pressed back by the weight of its difference in height, and her motion retarded by having that weight constantly to overcome. But, as it is often lost time to attempt accounting for uncertain facts, I determined to make an experiment of this, when I should have convenient time and opportunity.
"After our return to England, as often as I happened to be on the Thames, I enquired of our watermen whether they were sensible of any difference in rowing over shallow or deep water. I found them all agreeing in the fact that there was a very great difference, but they differed widely in expressing the quantity of the difference; some supposing it was equal to a mile in six, others to a mile in three. As I did not recollect to have met with any mention of this matter in our philosophical books, and conceiving that, if the difference should be really great, it might be an object of consideration in the many projects now on foot for digging new navigable canals in this island, I lately put my design of making the experiment in execution, in the following manner.
"I provided a trough of planed boards fourteen feet long, six inches wide, and six inches deep in the clear, filled with water within half an inch of the edge, to represent a canal, I had a loose board of nearly the same length and breadth, that being put into the water, might be sunk to any depth, and fixed by little wedges where I would choose to have it stay, in order to make different depths of water, leaving the surface at the same height with regard to the sides of the trough. I had a little boat in form of a lighter or boat of burden, six inches long, two inches and a quarter wide, and one inch and a quarter deep. When swimming it drew one inch of water. To give motion to the boat, I fixed one end of a long silk thread to its bow, just even with the water's edge, the other end passed over a well-made brass pulley, of about an inch in diameter, turning freely upon a small axis; and a shilling was the weight. Then placing the boat at one end of the trough, the weight would draw it through the water to the other. Not having a watch that shows seconds, in order to measure the time taken up by the boat in passing from end to end of the trough, I counted as fast as I could count to ten repeatedly, keeping an account of the number of tens on my fingers. And, as much as possible to correct any little inequalities in my counting, I repeated the experiment a number of times at each depth of water, that I might take the medium."
The experiment proved the truth of the boatmen's assertions. Franklin found that five horses would be required to draw a boat in a canal affording little more than enough water to float it, which four horses could draw in a canal of the proper depth.
No circumstance, remarks Mr. Parton, was too trifling to engage him upon a series of experiments. At dinner, one day, a bottle of Madeira was opened which had been bottled in Virginia many months before. Into the first glass poured from it fell three drowned flies. "Having heard it remarked that drowned flies were capable of being revived by the rays of the sun, I proposed making the experiment upon these; they were therefore exposed to the sun upon a sieve which had been employed to strain them out of the wine. In less than three hours two of them began by degrees to recover life. They commenced by some convulsive motions of the thighs, and at length they raised themselves upon their legs, wiped their eyes with their forefeet, beat and brushed their wings with their hind feet, and soon after began to fly, finding themselves in Old England without knowing how they came thither. The third continued lifeless till sunset, when, losing all hopes of him, he was thrown away." And upon this he remarks: "I wish it were possible, from this instance, to invent a method of embalming drowned persons in such a manner that they may be recalled to life at any period, however distant; for having a very ardent desire to see and observe the state of America a hundred years hence, I should prefer to any ordinary death being immersed in a cask of Madeira wine, with a few friends, till that time, to be then recalled to life by the solar warmth of my dear country."
Among the studies in natural philosophy of which but little is known to the general public may be mentioned Franklin's experiments with heat at a time when a thermometer was a scientific curiosity. The manner in which he proved that black cloth was not so good a covering for the body in hot weather as white, shows the simplicity of his methods and his faculty for making small means subserve great ends: "I took a number of little square pieces of broadcloth from a tailor's pattern-card, of various colors. There were black, deep blue, lighter blue, green, purple, red, yellow, white, and other colors or shades of colors. I laid them all out upon the snow in a bright sunshiny morning. In a few hours the black, being warmed most by the sun, was so low as to be below the stroke of the sun's rays; the dark blue almost as low, the lighter blue not quite so much as the dark, the other colors less as they were lighter, and the quite white remained on the surface of the snow, not having entered it at all. What signifies philosophy that does not apply to some use? May we not learn from hence that black clothes are not so fit to wear in a hot, sunny climate or season as white ones?" That all summer hats, particularly for soldiers, should be white, and that garden walls intended for fruit should be black, were suggestions put forth as a result of this experiment.
Dr. Small assigns to Franklin the credit of having discovered that repeated respiration imparts to air a poisonous quality similar to that which extinguishes candles and destroys life in mines and wells. "The doctor," he records, "breathed gently through a tube into a deep glass mug, so as to impregnate all the air in the mug with this quality. He then put a lighted bougie (candle) into the mug, and upon touching the air therein the flame was instantly extinguished; by frequently repeating this operation, the bougie gradually preserved its light longer in the mug, so as in a short time to retain it to the bottom of it, the air having totally lost the bad quality it had contracted from the breath blown into it." Upon being consulted with regard to the better ventilation of the House of Commons, he advised that openings should be made near the ceiling, communicating with flues running parallel with the chimneys and close enough to them to be kept warm by their heat. These flues, he recommended, should begin in the cellar, where the air was cool, and the flues being warmed by the hot air of the chimneys, would cause an upward current of air strong enough to expel the vitiated air in the upper part of the house. Franklin's letters at this time are full of the importance of ventilation. Unquestionably, he was among the first who called attention to the folly of excluding fresh air from hospitals and sick-rooms, particularly those of fever patients. As Mr. Parton expresses it, he cleared the pure air of heaven from calumnious imputation and threw open the windows of mankind.
Some inventions of Franklin's have not met with the approval of posterity. For instance, he seems to have had no more success with a reformed spelling of his own devising than laborers in the same field who came after him. He used to say that they alone spelt well who spelt ill, since the so-called bad speller used the letters according to their real value. The illiterate girl who wrote of her bo was more correct, he thought, than the young lady who would blush to omit a superfluous vowel. What was the use of the final letter in muff, and why take the trouble to write tough when tuf would do as well? Had he lived to see Dr. Webster's Dictionary, the lexicographer would have found in him an ardent champion. His reformed alphabet and spelling is an interesting curiosity, but hardly more. Some letters of our alphabet he omitted, only to add new ones. He also changed their order, making o the first letter and m the last. In this connection it may be well to say that Franklin was perhaps the first and foremost American champion of the movement, now so powerful, looking to the displacement of Latin and Greek as the foundations of education. At the very close of his life, in 1789, he issued his famous protest against the study of dead languages. He is reported to have said one evening, when talking about this matter: "When the custom of wearing broad cuffs with buttons first began, there was a reason for it; the cuffs might be brought down over the hands and thus guard them from wet and cold. But gloves came into use, and the broad cuffs were unnecessary; yet the custom was still retained. So likewise with cocked hats. The wide brim, when let down, afforded a protection from the rain and the sun. Umbrellas were introduced, yet fashion prevailed to keep cocked hats in vogue, although they were rather cumbersome than useful. Thus with the Latin language. When nearly all the books of Europe were written in that language, the study of it was essential in every system of education; but it is now scarcely needed, except as an accomplishment, since it has everywhere given place, as a vehicle of thought and knowledge, to some one of the modern tongues."
With all his love of the practical, Franklin was not deficient in a rather delicate wit. I have already had occasion to quote at the beginning of this paper his disclaimer of the honors conferred upon him by Turgot's famous Latin line. Instances of this dry humor may be found all through Sparks's exhaustive biography. I remember one in particular. The merchants of Philadelphia, being at one time desirous to establish an assembly for dancing, they drew up some rules, among which was one "that no mechanic or mechanic's wife or daughter should be admitted on any terms." This rule being submitted to Franklin, he remarked that "it excluded God Almighty, for he was the greatest mechanic in the universe."