1. Or more generally elements subject to definite laws of facility; such as those which Mr. Galton supposes to obey individually the simplest binomial law, and by their composition to constitute an approximate probability-curve, such as we find in rerum naturâ Phil. Mag. Jan. 1875
2. 1885. Methods of statistics. Journal of Statistical society, Jubilee, Number
3. 1875. Phil. Mag., Jan.