Enjoyed seeing HdeV yesterday.

Following the point mentioned by HdeV, CD has observed the difference in corrugation of primary roots in plants exposed to dry and damp soil.

Instructions to sow some seeds

and suggestions for experiment on effects of removal of bloom.

Likes Hugo de Vries very much; has hardly ever seen so modest a man.

He and Emma rejoice that GHD’s mathematical troubles are at an end. It is miraculous that he unconsciously followed the right course – like composing a sonata by a fluke.

Is glad WO is undertaking the editing of Anton Kerner’s book [Schutzmittel der Blüthen gegen unberufene Gäste (1876)], which appears to open out "highly original & curious fields of research". [Used as prefatory letter to Kerner, Flowers and their unbidden guests, The translation revised and edited by W. Ogle (1878).]

Asks FD to reply to a letter [11653a] requesting a list of CD’s books.

Thanks FBG for his offer [of geese for breeding experiments] but cannot undertake anything. Suggests FBG or any friend cross half-bred birds for a few generations; it would be a valuable contribution to science.

Comments on GJR’s lecture on animal intelligence [Rep. BAAS].

Comments on J. R. L. Delboeuf, La psychologie [1876].

Suggests that GJR keep a young monkey to observe.

Has changed his mind and would like some of FBG’s hybrids to breed from. Feels he should not lose the chance of perhaps recording the fertility of hybrids of two distinct species.

Is gratified by EV’s "spirited and able defence" in the article printed in La France [26 April 1878].

Heliotropic responses in aerial roots and tendrils.

Sends seeds received from Fritz Müller.

Has been reading WTT-D’s lecture ["Plant-distribution as a field for geographical research", Proc. R. Geogr. Soc. 22: 412–45].

Sends address of Fritz Müller.

Thanks him for ["Beiträge zur Geschichte der Bestäubungstheorie", in Program der Königlichen Gewerbeschule zu Elberfeld, 1877/78 (1879)]. Agrees with appreciation of Carl Sprengel’s work. Rejoices how highly GWJB appreciates Hermann Müller.

Heliotropism in roots.

Francis Darwin’s work on "bloom" and its relation to stomata.

Movements of flower-stalks of Oxalis.