Suggests collecting seeds at different heights from British Columbia.

Describes experiment on seeds from short anthers.

C. V. Naudin writes he has discovered cause of hybrid sterility.

Asks JJB for date of his article in the Field dealing with the regeneration of fishes’ fins; additional questions about the fish.

Wrote to [A.] Sawitsch regarding Russian pendulum experiments. Encloses Sawitsch's reply. Discusses experimental possibilities.