From W. R. Grove to Charles Lyell   2 July 1871

Dear Lyell

I forgot while you were with me to day to submit a problem in Darwinism to you   If you can get C Darwin to answer it I shall be glad   To what far distant origin can the configuration of the skin surface at the last points of the fingers & toes be traced   I enclose 3 impressions of my fingers which will explain what I mean   look at the symmetrical but different curves on each of them   What in the history of the species genus order &c does it come from¹

Ever yrs W R Grove