A little later Franklin founded a philosophical society, not intended to devote its energies to abstractions, but rather to a study of nature, and the spread of new discoveries and useful knowledge in practical affairs, especially in the way of farming and agriculture. Franklin always had a fancy for agriculture, and conferred many a boon upon the tillers of the soil. A good story, which may be true, tells how he showed the fertilizing capacity of plaster of Paris. In a field by the roadside he wrote, with plaster, THIS HAS BEEN PLASTERED; and soon the brilliant green of the letters carried the lesson to every passer-by. In 1743 Franklin broached the idea of an academy; but the time had not quite come when the purse-strings of well-to-do Pennsylvanians could be loosened for this purpose, and he had no success. It was, however, a project about which he was much in earnest, and a few years later he returned to it with better auspices. He succeeded in getting it under weigh by means of private subscriptions. It soon vindicated its usefulness, drew funds and endowments from various sources, and became the University of Pennsylvania. Franklin tells an amusing story about his subsequent connection with it. Inasmuch as persons of several religious sects had contributed to the fund, it was arranged that the board of trustees should consist of one member from each sect. After a while the Moravian died; and his colleagues, having found him obnoxious to them, resolved not to have another of the same creed. Yet it was difficult to find any one who did not belong to, and therefore unduly strengthen, some sect already represented. Finally Franklin was mentioned as being "_merely an honest man_, and of no sect at all." The recommendation secured his election. It was always a great cause of his success and influence that nothing could be alleged against his correct and respectable exterior and prudent, moderate deportment. He now endeavored to reorganize the system, if system it can be called, of the night-watch in Philadelphia. His description of it is picturesque:-- "It was managed by the constables of the respective wards, in turn; the constable warned a number of housekeepers to attend him for the night. Those who chose never to attend paid him six shillings to be excus'd, which was supposed to be for hiring substitutes, but was, in reality, much more than was necessary for that purpose, and made the constableship a place of profit; and the constable, for a little drink, often got such ragamuffins about him as a watch, that respectable housekeepers did not choose to mix with. Walking the rounds, too, was often neglected, and most of the nights spent in tippling." But even Franklin's influence was overmatched by this task. An abuse, nourished by copious rum, strikes its roots deep, and many years elapsed before this one could be eradicated.