From Asa Gray [early August 1856]
Summary
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.
Author: | Asa Gray |
Addressee: | Charles Robert Darwin |
Date: | [early Aug 1856] |
Classmark: | DAR 165: 93 |
Letter no: | DCP-LETT-1934 |
From Asa Gray 23 September 1856
Summary
Plants that are social in the U. S. but are not so in the Old World.
Distribution of U. S. species common to Europe.
Gives Theodor Engelmann’s opinion on the relative variability of indigenous and introduced plants and notes the effects of man’s settlement on the numbers and distribution of indigenous plants.
Author: | Asa Gray |
Addressee: | Charles Robert Darwin |
Date: | 23 Sept 1856 |
Classmark: | DAR 165: 94 |
Letter no: | DCP-LETT-1959 |
From Asa Gray 4 November 1856
Summary
Outlines the ranges of northern U. S. species common to Europe. Hopes to investigate the resemblances between the floras of the north-eastern U. S. and western Europe. Discusses routes by which alpine plants appear to have reached U. S.
Author: | Asa Gray |
Addressee: | Charles Robert Darwin |
Date: | 4 Nov 1856 |
Classmark: | DAR 165: 95 |
Letter no: | DCP-LETT-1982 |