Down, January 5th 1880.
As this note requires no sort of answer, you must allow me to express my lively admiration of your paper in the "Nineteenth Century." (296/1.
"Nineteenth Century," January 1880, page 93, "On the Origin of Species and Genera.") You certainly are a master in the difficult art of clear exposition.

It is impossible to urge too often that the selection from a single varying individual or of a single varying organ will not suffice.
You have worked in capitally Allen's admirable researches.

(296/2.

J.A.
Allen, "On the Mammals and Winter Birds of East Florida, etc." ("Bull.
Mus.Comp.Zoolog.

Harvard," Volume II.) As usual, you delight to honour me more than I deserve.