P.S. I have made yesterday & day before some observations which have surprised me greatly. The tendrils of Bignonia capreolata (as described in my book) are wonderfully apheliotropic, & the tips of quite young tendrils will crawl like roots into any little dark crevices. So I thought if I painted the tips black, perhaps the whole tendril w^d be paralysed. But by Jove exactly the reverse has occurred; on 2 occasions the tendril with blackened tips became along its whole length curved to dark side of box, long before its fellow-tendril with naked tips!² It looks as if the tips were like inhibitory nerve-ganglia, & when paralysed by being blackened allowed the rest of the tendril being immediately acted on; whereas the naked tips of the fellow-tendril prevented for a time the basal part of tendril obeying the action of light.— Or what is more probable the tips being blackened renders the basal part more sensitive to darkness. With the cotyledons of Phalaris & Avena blackening the tips rendered the basal part less or not at all sensitive to light.—³ I must somehow get more plants of Bignonia capreolata & find out whether whole observation is an error, or what on earth the case means.— It seems at present very odd. Last night the difference between the tendril with blackened tips & its fellow one was most conspicuous.—

Having no one to talk to, I scribble this to you.—