II. Mathematical contributions to the theory of evolution. II. Skew variation in homogeneous material

In the deduction of the normal curve of frequency from the symmetrical point binomial, three conditions are usually assumed to be true:— (a.) The chances of any “contributory cause” giving its unit of deviation in excess or in defect are presumed to be equal. (b.) The number of “contributory causes” are supposed to be indefinitely great.