Asks AG to confirm whether Ipomoea leptophylla "makes a great tuber as big as a mangel-wurzel".

Petioles of Cotyledons behave partly like those of Megarrhiza.

Thanks for Megarrhiza seeds and information. Has been greatly interested by Megarrhiza germination.

Samuel Butler has attacked CD over Erasmus Darwin.

Germination and root of Ipomoea.

Encloses a letter from Volney Rattan of California.

Thanks for the letter from Volney Rattan [see 12553].

Discusses protective adaptation of seedlings from frost.

Confirmation of CD’s idea: AG planted seeds Ipomœa pandurata. One seed has come up and its germination is same as of I. leptophylla.

Information about Ipomœa jalapa.

Apologises for his silence when Francis Darwin’s paper was read at the Linnean Society.

AG’s review of Movement in plants [Nation 32 (1881): 17–18].

Thanks for AG’s reviews [of Movement in plants] in the Journal and Nation [Am. J. Sci. 3d ser. 21 (1881): 245–9 and Nation 32 (1881): 17–18], especially for AG’s comment about Frank Darwin.

Asks AG to forward [unspecified] enclosure to Chauncey Wright.

Is collecting facts on variation; questions AG on the alpine flora of the U. S.

Sends a list of plants from AG’s Manual of botany [1848] and asks him to append the ranges of the species.

Has filled up CD’s paper [see 1674].

Distribution and relationships of alpine flora in U. S.

Suggests AG append ranges to the species in the new edition of his Manual.

Is interested in comparing the flora of U. S. with that of Britain and wishes to know the proportions to the whole of the great leading families and the numbers of species within genera. Would welcome information on which species AG considers to be "close" in the U. S.

Sends a list of "close" species from his Manual of botany.

Hopes Hooker or CD will write an essay on species. Discusses some of the difficulties of defining botanical species.

Geographical distribution. "Close" species. Hopes AG will write an essay on species.

"Close" species in large and small genera.

Alphonse de Candolle on geographical distribution [Géographie botanique raisonnée (1855)].

Species variability.

Suggests affinities of the U. S. flora that he considers would be worth investigating. Wants to know the ranges of species in large and small genera.

Questions AG on naturalised plants; whether any are social in U. S. which are not so elsewhere and how variable they are compared with indigenous species. Would like to know of any differences in the variability of species at different points of their ranges and also the physical states of plants at the extremes of their ranges.

Asks whether Allegheny Mountains are sufficiently continuous so that plants could travel from north to south along them.

Hopes AG’s work on geographical distribution is progressing, as he has questions on plants common to Europe which do not range up to Arctic.

Are intermediate varieties less numerous in individuals than the varieties they connect?

Believes intermediate varieties are generally less numerous in individuals than the two states that they connect.

Discusses the difficulties of deciding what is the typical form of a species

and gives some opinions on the variability of introduced species compared with indigenous species.

Rarity of intermediate varieties.

Variability of introduced plants.

Ranges of plants common to Europe and U. S.