To Hugo de Vries   10 November 1875

Dear Sir

Your very kind letter has pleased me greatly.¹ I write now to suggest, if you make any more observations on tendrils, to attend to the very curious case described at p 132 of my book under Echinocystis,—namely that the extremity of a tendril which has curled half round a small cylindrical stick, can by an undulatory movement, curl twice or thrice round the stick. This seems to me a point worthy of further investigation, and if my measurements can be trusted shows that the movement is not due to growth along the convex surface.²

With much respect | I remain | Dear Sir | Yours faithfully | Charles Darwin