My dear Strickland

I must send a line to thank you for your letter.— You have been of the greatest use to me,—though really you might have spared yourself the trouble of your last letter.— I am in truth ashamed of the quantity I have made you write. In your last letter, you have put the solution to my difficulties in a perfectly clear light.—

I cannot but think it w^d be a good thing occasionally to bring your Report on Nomenclature to the recollection of all by any even the slightest corrections—as for instance the X Edit of Linn. (giving year) being the starting point¹ —(this is surely a material point) Have you tried any of the foreign congresses to see if they will not formally adopt it—Or the Institute of Paris &c.—²

I feel some difficulty about your type species: I always arrange genera in as natural order as I can, & then one puts the species nearest allied to former genus first. I have not had much experience in making genera, but in two just formed & perfectly natural, I declare I could not possibly pretend to say which sh^d be considered the type; yet they differ from each other in some important points.— I cannot but think this must often happen.— Hurrah no more trouble about Pentalasmis Anatifera & Anatifa!—³

Yours most sincerely | C. Darwin

I am thinking of coming to Malvern for a couple of months in April to see if I can do my wretched health any good.—⁴