Further data are given on the inheritance of the dominant black of the Black Welsh Mountain breed.

Results are given that have a bearing on the question of the origin of dominant blacks and the inter-relationship of the dominant blacks of various breeds. It is possible that more than one factor exists that can produce dominant black.

It is shown that in the presence of the dominant black factor the factors for badger-face pattern and reversed badger-face pattern cannot be expressed.

A brief account is included of some of the modifications of black colour.

A very brief summary is given of the present state of knowledge regarding the genetics of coat colour in the sheep.