Abstract This paper contains a further record of experiments which were begun at the same time as those recorded in my first paper. The method of interpreting results in the present paper is the same as that used in the first one, and is based upon the same working hypothesis, i. e., Bateson and Punnett’s “Presence and Absence” hypothesis and Cuénot’s theory of colour. The cost of these experiments has been defrayed by a grant from the Government Grant Committee of the Royal Society. The Experimental Matings. (1) (a) Cr 4 × Cr 4 = Albino × Albino. Twenty pairs of albinoes were mated. There was a total offspring of 174 individuals, all albinoes. Some of these albinoes had a near albino ancestry, while others had a pigmented one. The details of the ancestry made be seen upon reference to the Table of Ancestry, pp. 390—391.