Notebook recording Bateson and Punnett's experiments with sweet peas, labelled inside ‘Sw Peas, pot sowings 1905’. There is an index at the back [pp 236r-241].

The general format of the record is that the parents are recorded as numbers with a superscript or sometimes as a named variety. Since sweet peas can be selfed, some crosses have only a single parent. The date of sowing or planting out is often recorded, together with other observations on the plants such as colour.

A note on [page 78v] states that Bateson bet Punnett five shillings 'that P.L.s come in next generation'; the bet is marked 'Taken' and initialled by Punnett. The plants on [pp 131v-132 and 158v-159] are marked 'important' and 'v. important'. Those on [page 166v-167] are marked 'save all'.