Huxley feels he can accept the Edinburgh lecture invitation.

Also tells JDH he is preparing a paper for Linnean Society on classification which will uphold evolution ["On the classification of the animal kingdom", J. Linn. Soc. Lond. (Zool.) 12 (1876): 199–226]. He has thrown overboard all his old ideas of definite demarcation. He will make a clean breast of it, and will bear hard on necessity of all such ideas as Haeckel’s in dealing with systematic zoology.