STIMULATION ON TURGESCENT VEGETABLE TISSUES. 9 
takes place at a temperature only slightly lower than the tem- 
perature which causes death. This seems to be sometimes the 
case in our experiments: the rate of “growth ” increases until 
suddenly it becomes much slower and stops altogether. In 
other cases the “ growth” begins to get slower at a temperature 
considerably below the fatal temperature. But in these cases 
also there is a sudden fall in the rate of “growth” just before 
death occurs. 
Errerct or REAGENTS. 
1. Stimulating Effect of Alcohol. 
The pith was fitted up in a cylinder of water and, as soon as & 
few readings had been taken, the spirit was added in such a way 
that it mixed quickly with the water. It has been shown that 
after a short immersion in water, growth begins to slow down, so 
that any acceleration in the rate can be very clearly seen. 
Exp. 6.— Aug. 25, 1886. Sunflower-pith. 
Times of observation. Bate of * growth." Tan perntaro. 
P.M. . 
J  ......... Water ae in. 20:5 
BIRD ......... e s 
81 ji e 
71 ý 
72 » 
75 » 
BAZ  ..........22.. 72 á 
Siphoned out water, 
2 per cent. spirit in. 20 
844  .......e 108 " 
$45 EEE 99 » 
93 " 
846 — eee 75 5 
Result with methylated spirit 2 per cent. : acceleration 100: 150. 
Exp. 7.—Sept. 7, 1886. Jerusalem-Artichoke pith; lever. 
Times of observation. Rate of “ growth.” Temperature. 
.M. . 
1211 "— Tap-water put in. 19.5 
1215  ..............-. 344 » 
285 » 
12155 .................. 256 » 
250 5 
12.34 — ............... os 222 » 
238 » 
12175 ................. 222 " 
1218  ............... 200 » 
1230  ............... 149 " 
