384 MacDougal . — The Mechanism of 
taken at random from my note-book, will fully illustrate this 
point. 
Plasmolytic experiments. Plasmolysis was effected by means 
of a 1 per cent, solution of potassium nitrate in a flat porcelain 
dish, in which the tendrils were gently placed. During the 
preparation they were unavoidably slightly stimulated, and 
their stature is noted in the first line of the description of 
each experiment. 
I. 
Dec. 24, 9.15 a.m. Tendril of Cucurbita , 18 cm. long, with tip curved 
through 300°, with radius of 1*5 cm. placed in solution. 
„ 9.30 a.m. 3 complete circles with a radius of 6 cm. 
,, 12 a.m. 4 circles. 
„ 2.30 p.m. 3I circles. 
Dec. 25, 10 a.m. ij circle. 
„ 4 p.m. Same. 
Dec. 26, 9 a.m. Same. 
Dec. 27, 11 a.m. Same. Placed in distilled water. 
„ 2 p.m. if circle. 
Dec. 28, 2 p.m. 3J circles. 
Dec. 29, 2 p.m. Curves strengthened. 
II. 
Dec. 24, 9.15 a.m. A tendril of Cucurbita , 25 cm. long, with curve of 
250° at tip, with radius of 4 cm. placed in solution. 
Dec. 24, 9.30 a.m. 4 circles with a radius of -2 to -4 cm. were formed 
at the tip; entire tendril curved through 180 0 . 
Dec. 24, 12 a.m. 5 circles at tip. Curve of tendril strengthened. 
„ 2.30 a.m. 5 circles. Curve of tendril of shorter radius. 
Dec. 25, 10 a.m. 6 \ circles. Curve of entire tendril 320°. 
„ 2 p.m. 7 circles, ij circle in entire tendril. 
Dec. 26, 9 a.m. 7 circles, ij- circle in entire tendril. 
Dec. 27, 11 a.m. 8 circles, ij circle in entire tendril. Placed in 
distilled water. 
Dec. 27, 2 p.m. Curves contracted. 
Dec. 28, 2 p.m. Curves contracted. 
