The Journal of Philosophy, Psychology and Scientific Methods, Vol. 2

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Excerpt from The Journal of Philosophy, Psychology and Scientific Methods, Vol. 2: January December, 1905 In the first place, it is important to determine the modes of the characters of various species at a given place and time, and compare them with similar modes observed at other places and times, in order to discover just how much evolution, if any, is going on and in what direction the species is moving. We also have, in the shape of the curve, a measure of the vari ability of the organ, and can compare it with the variability of other organs, e. G., to discover if secondary sexual characters are really extremely variable. When plotted on the same scale, the more variable character will give a low ¿at curve, while the less variable one will give a curve with short range, one in which most of the individuals are grouped in, or near, the modal class. The range is itself a measure of variability, but a very poor one. A much better one is the o of the formula given above. It is the square root of the average of the squared departures from the mean in both dirce tions, and is called the standard deviation. 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.