Explains more clearly what he is looking for in his work on poultry: relative variation at different ages, the effect of disuse on different parts, breeding between wild and domestic, and degree of fertility of "mongrels of very diverse races".
William Yarrell has assured him that call ducks cross freely with common varieties. CD would like a seven-day duckling and an old one that dies a natural death.
CD is depressed – all his experiments are going wrong, "all nature is perverse and will not do as I wish it". Feels he is getting out of his depth.
Asks WDF to induce schoolboys to collect eggs of lizards and snakes for him. He will see whether they float and stay alive on sea-water.
He may insert his request for lizards’ eggs in Gardeners’ Chronicle.
His study of mongrel chicks is to ascertain whether the young of domestic breeds differ as much as their parents.
Has already sent a communication on means of distribution of plants by sea to Gardeners’ Chronicle [Collected papers 1: 255–8].
Thanks WDF for specimens and his great help to CD in his work on variations in young and adult ducks and poultry. Has found feet of tame adult ducks weigh twice as much as those of wild ones.
Several seeds have come up after 65–70 days’ immersion in salt water.
Has now a fine collection of pigeons and intends to cross them systematically.
Needs information on mongrel crosses of animals of all kinds.
Describes his method of putting young poultry to death.
Asks questions arising from WDF’s reply about crossed mongrels.
Has received the duck and bantam.
Anxious to get as many facts as possible on crossbreeding of dogs.
Reports on seeds that have germinated after 100 days immersion [in salt water].
Reports on his collection of skeletons of young and adults of various breeds of fowls and specimens still needed.
CD now has a sufficiently large collection of [skeletons of] chickens to be able to tell how far the young differ proportionally from the old.
He goes on accumulating facts; what he will do with them "remains to be seen".
Attended Glasgow BAAS meeting. "Duke of Argyll spoke excellently" [Rep. BAAS (1855): lxiii–lxxxvi].
Lists his pigeon collection.
Thanks WDF for his help and reports on progress in "the Cock and Hen line of business". Has written to every quarter of the world for skins of poultry and pigeons.
As for seeds, Hooker and Bentham obstinately refuse to believe they can live even a few years in the ground.
Is trying to procure some cocks for CD.
Believes Scotch deerhounds are mongrels.
Believes WDF’s case of mongrel Scotch deerhound is very valuable for him.
Mentions his work on pigeons and chickens.
Fears sometimes he will break down: "My subject gets bigger and bigger".
Thanks WDF for specimen of Dorking cock.
The responses to his queries on domestic variations are coming in from all over; believes he will make an interesting collection. At present concerned with rabbits and ducks.
Has told Lyell of his views on species and CL urges CD to publish a preliminary essay. Has begun to work on it, with fear and trembling at its inadequacies.
Does not intend to work systematically on cats. Their origin is in doubt and they have been crossed too many ways.
It would be valuable to know whether half-bred ducks are fertile inter se or with a third breed. Is investigating this with pigeons.
Finds his grief over his daughter Anne’s death still strong.
Is following Lyell’s advice about publishing his species doctrine. It is not to be a sketch, however, but as perfect as his 19 years of work will allow. His work on pigeons has been invaluable on many points. "No subject gives me so much trouble as means of dispersal of terrestrial production in the oceanic islands."
Finds "most remarkable differences" in skeletons of rabbits.
Has taken birds with seeds in crops to Zoological Society and fed them to eagles and owls. Pellets with seeds in perfect condition were "thrown up" in 18 and 16 hours, showing an effective means of distribution.
Asks WDF to write to his nephew in Jamaica to try experiments with floating lizards’ and snakes’ eggs in sea-water, to see if they survive.
Informs CD that in his experience with peas he has never found the seed to deteriorate.
Birth of his sixth son [C. W. Darwin]. It is dreadful "to think of all the sendings to school and the professions afterwards".
CD is not well but has not the courage for water-cure again; trying mineral acids.
Working hard on the book [Natural selection]; is overwhelmed with riches in facts and interested in way facts fall into groups.
To his surprise [Helix pomatia] has withstood 14 days in salt water.
Pigeons’ skins come in from all parts of the world.