[101]

Cissus discolor

7 inches high. On third a leaf the 3d from apex on a shoot from cut-down plant not nearly fully grown, yet 2 inches in length, glass filament with 2 triangles of paper affixed, & movement traced on vertical glass, was observed, & its m during 31h. 30 m. under skylight— The Day was cold & if plant removed from had been observed in the Hot-House — (Tem. 15°-16° Cent.)— If observed in Hot House no doubt wd have moved more.= the circumnutating now plain enough wd have been more curve See tracing from 10' 35' a.m on 28' to 6° P.m. on 29th. There can be no doubt about circumnutation —[calculations] Stem secured to stick close beneath petiole of leaf. — Apex of leaf only 8 3/4 inches from vertical glass.—