Hist." Volume XIV., page 104 (with plate), 1864.

Translated by W.S.Dallas from "Wiegmann's Archiv," 1863 (see also "Facts and Arguments for Darwin," passim, translated by W.S.

Dallas: London, 1869).) This seems to me the most interesting discovery in embryology which has been made for years.
I am much obliged to you for telling me a little of your plans for the future; what a strange, but to my taste interesting life you will lead when you retire to your estate on the Itajahy! You refer in your letter to the facts which Agassiz is collecting, against our views, on the Amazons.

Though he has done so much for science, he seems to me so wild and paradoxical in all his views that I cannot regard his opinions as of any value.
LETTER 189.

TO A.R.WALLACE.