"It is in the great cities that vice has spread her temptations, and pleasure her seductions, and folly her allurements; that guilt is encouraged by the hope of impunity, and idleness fostered by the frequency of example. It is to these great marts of human corruption that the base and the profligate resort from the simplicity of country life; it is here that they find victims whereon to practise their iniquity, and gains to reward the dangers that attend them. Virtue is here depressed from the obscurity in which it is involved. Guilt is matured from the difficulty of its detection; licentiousness is rewarded by the immediate enjoyment which it promises. If any person will walk through St. Giles's, the crowded alleys of Dublin, or the poorer quarters of Glasgow by night, he will meet with ample proof of these observations; he will no longer wonder at the disorderly habits and profligate enjoyments of the lower orders; his astonishment will be, not that there is so much, but that there is so little crime in the world. The great cause of human corruption in these crowded situations is the contagious nature of bad example and the extreme difficulty of avoiding the seductions of vice when they are brought into close and daily proximity with the younger part of the people. Whatever we may think of the strength of virtue, experience proves that the higher orders are indebted for their exemption from atrocious crime or disorderly habits chiefly to their fortunate removal from the scene of temptation; and that where they are exposed to the seductions which assail their inferiors, they are noways behind them in yielding to their influence. It is the peculiar misfortune of the poor in great cities that they cannot fly from these irresistible temptations, but that, turn where they will, they are met by the alluring forms of vice, or the seductions of guilty enjoyment. It is the experienced impossibility of concealing the attractions of vice from the younger part of the poor in great cities which exposes them to so many causes of demoralisation. All this proceeds not from any unwonted or extraordinary depravity in the character of these victims of licentiousness, but from the almost irresistible nature of the temptations to which the poor are exposed. The rich, who censure their conduct, would in all probability yield as rapidly as they have done to the influence of similar causes. There is a certain degree of misery, a certain proximity to sin, which virtue is rarely able to withstand, and which the young, in particular, are generally unable to resist. The progress of vice in such circumstances is almost as certain and often nearly as rapid as that of physical contagion." And elsewhere: