Corrects a misunderstanding of his description of salt deposits [in South America, pp. 74–5]. The salt referred to was from Rio Negro, and was coarsely crystallised and free of other saline substances found in sea-salt. CD believes its lesser value in curing meat is owing to the absence of muriates of lime and magnesia and suggests that it might be worth while to add them to the Rio Negro salt.

Suggests that the scarcity of holly berries is owing to the scarcity of bees during the spring, rather than to frost. He does not know what caused the scarcity of bees.

CD confesses his error with respect to the cause of the scarcity of holly berries. It appears that several causes in combination have led to it. CD still believes rarity of bees played a part, though a subordinate one.

Replies to some of George Henslow’s criticisms [of Cross and self-fertilisation] made in his article ["Fertilisation of plants", Gard. Chron. n.s. 7 (1877): 203–4].

Reports on the effect of potato blight in his crop.

Asks readers of Gardeners’ Chronicle whether they have experience with light wire rope instead of chain in drawing water buckets from deep wells. Describes the problem of his own well with its 325 foot chain.

Solicits information about the kind of syphon required to convey water from a proposed large water tank to existing smaller ones.

CD describes his experiments on the effects on germination of the immersion of seeds in sea-water. Hopes to throw light on the distribution of plants. Asks readers of Gardeners’ Chronicle to inform him whether such experiments have already been tried and what class or species of seeds they suppose would be particularly liable to be killed by sea-water.

Reports on his experiments on action of sea-water on seeds and the bearing of his investigations on the theory of centres of creation and Edward Forbes’s theory of continental extensions to account for distribution of organic forms. CD’s experiments confirm germination powers were retained after 42 days’ immersion by seven out of eight kinds of seeds.

Will be obliged if any reader can provide eggs of lizard Lacerta agilis. Wants to ascertain whether they float in sea-water. Offers reward of a few shillings to boys for collecting.

Reports on observing hive-bees visiting the leaves of vetch and bean and sucking the minute drops of nectar secreted by the glands on the underside of the stipulae. This phenomenon proves wrong those botanists who believe nectar to be a special secretion for the sole purpose of luring insects to visit flowers and thus to aid in their fertilisation.

CD requests further details about a rain of shells on the Isle of Wight reported by a Gardeners’ Chronicle correspondent.

Reports a case of charlock seeds that retained their vitality for at least eight or nine years. He suggests that their power of retaining vitality when buried in damp soil may be an element in preserving the species and therefore seeds may be specially endowed with this capacity, while the power of retaining vitality in dry, artificial conditions may be an indirect accidental quality of little or no use to the species.

Sends final results of his experiments on the vitality of various kinds of seeds immersed in sea-water. Corrects a false assumption he made in an earlier letter [1684] that plants with ripe seeds would float for some weeks. Now finds that they sink within a month. Since all the seeds he tried sank in sea-water, his experiments are of little or no use "in regard to the distribution of plants by drifting of their seeds across the sea".

Corrects a misprint in his letter [1783].

Adds that his experiments show that one cannot infer from the vitality of seeds under dry conditions that they will be preserved in different conditions. Cites the poor ability of Leguminosae to withstand immersion.

Cites [from Gärtner’s Bastarderzeugung (1849), p. 157] a report that seeds from graves of ancient Gauls germinated.

CD requests accurate information on the extent to which the different varieties of fruit-trees produce seedlings like their parents. Do some varieties of pears and apples tend to produce truer offspring than other varieties?

CD is collecting all the evidence he can on natural crossing of varieties of plants. Asks readers of Gardeners’ Chronicle to give evidence "showing either that Leguminous crops, when grown close together do sometimes cross or on the other hand that they may invariably be grown close together without any chance of deterioration".

Reports that he fertilised a single pale red carnation with the pollen of a crimson Spanish pink, and a Spanish pink with the pollen of the same carnation. He got seed from both crosses and raised many seedlings. There was no difference between the seedlings from reciprocal crosses, not one plant set a single seed.

Requests information from readers on breeding of dun or mouse-coloured ponies with a dark stripe down their backs. Must one or both parents be dun?