Reports making graft-hybrid potatoes.

Has found direct action of pollen in Mays [Zea] crosses and apple-trees.

F. Delpino has asked for CD’s address.

Congratulates FH on graft-hybrid of potato. Importance of FH’s discovery to be discussed in Variation [2d ed., 1: 420].

Sends graft-hybrid notice.

Thanks CD for mentioning his Corydalis and Primula experiments in Variation.

Has become Professor of Botany at Freiburg.

Encloses specimen of Corydalis cava.

Potato graft-hybrid fails to give potatoes.

August Weismann requests Wallace’s address to find out about experiments on butterflies hinted at in Variation.

Suggests FH’s graft-hybrid potatoes should remain with FH.

Sends addresses of Alfred Russel Wallace and Alexander Wallace for August Weismann.

Thanks for Botanische Zeitung notice of CD’s paper ["On the character and hybrid-like nature of the offspring from the illegitimate unions of dimorphic and trimorphic plants", J. Linn. Soc. Lond. (Bot.) 10 (1869): 393–437]. FH writes clearest style of all German authors.

Asks that August Weismann be told about papers by Wallace and Bates.