Notebook recording rabbit breeding experiments conducted by Bateson and Punnett in 1910-1913, on rabbits born between circa April 1910 - July 1910.

The notebook begins with a five-page index providing summary information for 240 rabbits: the sex, colour, and parentage of each, with a checkmark to indicate rabbits used for further breeding. More detailed records for each rabbit begin on [page 1].

The general format of the record is that each animal has a separate page. The page is headed with the cross, e.g. ex 22 x 28, which denotes the parents. The birth date is recorded, together with phenotypic characteristics like coat colour, etc., descriptions of litters if the animal was allowed to breed, and notes on when each rabbit died or was killed. The record for the rabbit on [page 172] includes a drawing of its 'part-bluish' eye.