Reprint of the original, first published in 1875.

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Excerpt from Pisciculture: An Address on the Artificial Breeding of Fish, Their Habits, Etc;, Delivered Before the Detroit Scientific Association The waters, as well as the soil of the earth, are largely drawn upon for the subsistance of mankind. The savage visits the streams and the lakes no less than the woods for the game upon which he lives. And man in a civilized condition of life depends nearly as much upon the products of the fisheries as upon those of the fields. Though the land in a state of nature yields each of the various kinds of fruit and grains employed as food, still the supply is only sufficient to maintain man and animals living purely in a state of nature. The principle is simply that of the equilibrium of demand and supply as a natural condition of things. Whenever by the various vicissitudes of season, of soil and of climate, the demand exceeds the natural supply, the equilibrium is preserved through the destruction by famine and by violence of a portion of the population. This is the so-called struggle for life, which is more or less observable everywhere among men and animals in a state of nature. Thus the demand is regulated by the supply. In other words supply is the independent variable, and demand the dependent one. Under a civilized condition of life, on the other hand, supply is regulated by demand, rather than demand by supply. The wants of mankind, instead of the means of supplying want, constitute the independent quantity. The supply is constantly being compared with the demand as a standard. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.