Pressland offers information on heredity, following a paper Ewart gave at the Royal Society in London. He cites several instances of cattle with exceptional colouring.

Pressland suggests ways of getting information about various long-lived human species, and gives examples of human and animal inbreeding. He puts forward the idea that the Duke of Bedford might take up the study of the subject of inbreeding, and suggests ways in which Ewart might gain an introduction.