Delighted with Farrer’s assistance. A. Helps has also spoken to Sir S. Northcote.

JDH is getting on well but has periods of great depression.

K. G. Semper’s article ["On the relationship of the Vertebrata and Annelida", Ann. & Mag. Nat. Hist. 15 (1875): 94–5] is ill-natured. Misinterprets facts already discovered by F. M. Balfour.

Has been working on Amphioxus. Puts his theory of vertebrate skulls on firm footing at last.