Many or most of the towns, both in British and Spanish America, are formed on regular plans, commencing with a square as a nucleus, to the faces of which the streets (as they rise) are made parallel, so that whatever may be the extent of the town the increments take place in regular order, until stopped by some natural obstruction; and though it may be true we cannot now enjoy the good effect of any such original precaution, yet as respects the extension or future increments of our cities and towns, much benefit may still be derived by resorting to system; and though we cannot now remodel what has been built by proceeding regularly from a central point to the circumference, yet we may adopt an external line or periphery as a basis of operation for the construction of the future extension of the town on a regular plan or system.
It is fortunate for the metropolis that there existed some large landowners in its vicinity, as the families of Bedford, Grosvenor, and Portman, whose taste and spirit corresponded with their means, and that large portions of the increments of London consequently possess all the advantages that a well-considered system of utility could require; and the benefit of such a circumstance will be best felt by contemplating what effects a contrary proceeding would have produced; and further, the plans pursued by the above-named families have not only been highly beneficial in themselves, but they have served to stimulate the small proprietors in their vicinity to the same useful ends; and what seems to be wanted from the authority of the state is the means of ensuring such beneficial measures in all cases, or at least protection against antagonist or vicious proceedings in the owners of land adjoining towns.
It will not fail to be remarked that the increments of London just alluded to have been constructed chiefly for the abodes of the wealthy, who can generally protect themselves, and remove from any noxious neighbourhood. But the state, as the natural guardian of the poor, is the more called upon to interfere with its authority to see that the streets and houses intended for the labouring classes are constructed on comfortable and sanitary principles.
Most of our large towns have increased upon small, irregular nuclei, and received their increments chiefly from buildings erected along the roads branching into the country, presenting so many main streets radiating from a centre, but leaving the intervening spaces to be irregularly and imperfectly filled up at subsequent periods as chance or necessity directed, and in this manner has arisen the great defect (to be generally observed) of a good lateral connexion between the great radiating streets.
So great indeed is the above defect that it is often difficult to pass from one site in the skirts of a town to an adjacent one without passing towards the centre of the town by one radiating street and returning by another; this defective construction of towns is the natural result when they extend without any reference to a general plan or public convenience, and the mode which, in my opinion, would best restore the condition of a town so constructed to a commodious and useful state would be as follows:
I would propose, in the first instance, to connect all the radiating streets of the town by straight lines drawn as near to the mass of buildings in the town as the vacant or unbuilt ground would admit of; this operation would have the effect of inclosing the town in an irregular polygon, upon each side of which, as a normal line, I would propose to lay out the future streets, one series of which would be parallel to the normal lines, and another series would be perpendicular to them, and in this manner the future increments of the town would proceed on a fixed and uniform system, and would render the lateral lines of communication as effective as the others, and would afford at the same time increased facilities for ventilation and sewerage, and for the supplies of water, gas, &c.; and proceeding on this system, it may fully be anticipated that the building sites would become much more valuable to their owners than if they remained to be laid out by individual caprice on a disjointed plan. It would be valuable in most cases that the normal polygon should be formed into a series of streets of ample dimensions, fit for the reception of public buildings, particularly schools; and occurring (as it would do) as the nearest great lateral line of communication to the irregular mass of the town, it would serve to do much of the duty in way of communication and ventilation which the interior mass had left undone, and was unable to effect, and might answer as the great respiratory of the town, and would be well adapted to serve, if wide enough, and planted, for alamedas, or public walks.
In London, the line of the New Road and City Road furnishes almost the only sample the metropolis possesses of polygon lines of communication, and the utility of the sample is duly felt and appreciated. In Paris the line of the Boulevards presents a favourable specimen of the convenience and comfort of such a construction of streets.
The advantage of adhering to system in laying out new towns, or additions to old towns, will be much enhanced when we take into consideration the means of supplying water, gas, &c. to the houses; and as the application of science and machinery becomes more extended in administering to the comforts of towns, it is manifest the more regular the field of their action the more efficacious and economical will be the results. On the score of ventilation, as well as for other conveniences, it is important the streets should intersect and not abut on each other, that the currents of air may have free escape.[[49]]
One of the greatest evils arising from towns extending at caprice, without reference to any general plan, is the vast expense that subsequently arises when necessity demands communications to be made through crowded masses of buildings; such events are of frequent occurrence in the metropolis and other large towns, and so great is the outlay to remedy what might have been avoided, that no measures proposed for the improvement of towns merit such deep attention as these; and it has sometimes occurred to me, that instead of applying the funds to enlarging the leading thoroughfares, the object would in many cases be better served by forming entirely new communications through the worst constructed and less costly sites. In this manner we should have two good communications instead of one; we should open the means of communication, ventilation, and sewerage to places where at present they exist most imperfectly, and we should expunge from the map of the town a number of noxious, ill-ventilated ruinous buildings, the seats of dirt, disease, and demoralization.
Annexed is a plan of the town of Birmingham, on which is traced a study or design for the future increments of that town on the principles above proposed, which will serve to illustrate the views of the writer. The figure P P P P represents the normal polygon.