STIMULATION ON TURGESCENT VEGETABLE TISSUES. 5 
temperature of its surroundings; that is to say, “growth” ‘in- 
creases with increased temperature, reaches a maximum, and then 
diminishes. 
The method employed was simple. Hot water was allowed to 
run in at the bottom of the cylinder containing the pith, the 
overflow being regulated by means of a siphon. The hot water 
rises to the top, and as the overflow-siphon dipped to the bottom 
of the cylinder, there was a fairly good mixture of hot and cold 
water. Nevertheless the temperature was not quite uniform 
throughout, the upper part being about 0°5 C. higher than the 
lower. 
Exp. 3.—Aug. 18, 1886. Sunflower-pith ; lever. 
Times of observation. Rate of “ growth.” Temperature. 
P.M. . 
12.20  .................. 00 eere 16 
1235  ...............-- 142 » 
138 ” 
114 » 
122555 ................. Hot water turned on. 
12.265 ................-. 18 
82 19:2 
85 20:5 
101 22 
101 245 
1230  .............. 126 26 
153 » 
1231  ................. 161 285 
181 " 
250 29:5 
1233  ..............-. 344 355 
357 ul 
333 38:5 
333 , 
12.345.222 344 41:5 
400 43 
322 » 
333 ” 
1236  ..............-- 333 » 
285 45 
322 48 
312 » 
123375 ............... 303 505 
285 52 
12.405 ................-. 
243 54 
238 s 
12422 eee 238 55 
204 56 
192 , 
12455 ............ nenn 28 56:2 
