My dear Sir—

I write a single line to say that I do not see in your Index to the “Origin of Species” any reference to the point of the “Variability of Rudimentary organs”— This point you touch upon in Pages 149 & 168. And it may be illustrated in the concrete from Leuckart in the Cyclopædia of Anatomy Article “Vesicula Prostatica” p. 1424,¹ & from Leydig Zeitschrift Wiss. Zoologie ⁠⟨⁠    ⁠⟩⁠.1.38. ‘a propos of the same structure—²

Yours very Truly | George Rolleston—