Sends a model of bee cells "as bad as a Chinese puzzle". [A series of paper cut-out figures.]
Discusses geometry related to the structure of bees’ cells. Encloses notes and diagrams dealing with intersections of spheres.
Wonders whether CD would be interested in a book by Dr Bucknell [J. C. Bucknill?] on psychology.
Writes of "the Dr’s" [Henry Holland’s] mixed reactions to the book.
Adds a personal opinion, "it is the most interesting book I ever read".
Is hopeful about Anne after receiving an encouraging message.
Gives her reactions to CD’s reports on Anne’s health.
Discusses Anne’s sickness and her hope.
Thanks CD for his Monday notes about Anne, which are much better than previous ones.
Tells of the hopes raised by CD’s letter of Monday regarding Anne’s health.
Her reactions to Anne’s death; hopes CD may soon return.
Letter from school with instructions where to put away his belongings at home.
Is looking forward to returning home [from Moor Park hydropathic establishment]. News of other patients and the books she is reading. Although feeling well, cannot walk much.
Commiseration on the death of Anne.
His experience confirms CD’s view that some species and even some genera of Brachiopoda are consistently more variable than others, and that such variable forms are variable in all localities and at all periods. Similarly a species that shows a lack of variability does so at all points in time and space. Discusses the causes of variability. [See Natural selection, p. 106.]
Responds to CD’s letter. The ova of Salmonidae exposed to air, if kept moist, will stay alive up to 72 hours.
On the ova of the salmon in relation to the distribution of species.
On the vitality of the ova of the Salmonidae at different stages of development.
His observations on Subularia: has never seen it in flower in the air.
Sends specimens of Tortrix, which illustrate the extraordinary variation of markings in two or three species. In every family of Lepidoptera there seem to be species extremely prone to vary and in some localities they vary more than in others.
The variations of Peronea caused A. H. Haworth and J. F. Stephens to create 30 or 40 species based on colour and markings. HD was first to be convinced these would be reduced to two.
Discusses species that closely resemble one another;
cites species that differ in variation in different localities;
in some double-brooded species the broods differ markedly in size and colour.
Encloses his list of varieties of Peronea.