STIMULATION ON TURGESCENT VEGETABLE TISSUES. 
19 
Exp. 17.—Aug. 3, 1886. Jerusalem-Artichoke pith; auxano- 
meter-lever. 
Times of « » 
observation. Rate of “ growth. 
P.M. 
6.125  ............ 199 
125 
104 
515  ........... 104 
5.8 — ............ 66 
5.195  ............ 56 
Result: slight acceleration. 
Times of 
observation. 
eecco occ 
EID 
Rate of “growth.” 
2:2 per cent. 
Exp. 18.—Sept. 7, 1886. Jerusalem-Artichoke pith ; lever. 
Times of observation. 
P.M. 
$931  ................. 370 c. c. tap-water. 
$9155 .................. 172 
153 
9.825 ................-. 153 
33306 ......... cese 138 
$9.84 ee 133 
0:2 c. c. ammonia added 
(=2°4 per cent.). 
$.8b re P^ 06 
172 
$355 ................. 166 
149 
38.96 . ................-. 158 
$.865 .................. 138 
$97  .....2scseee 128 
Result: aeceleration. 
Rate of “ growth." Temperature. 
50 
18-5 
In the following experiment the effect of ammonia in the form 
of vapour is shown. 
Exp. 19.—July 31, 1886. Jerusalem-Artichoke pith; with 
auxanometer-lever. 
Times of « » 
observation. Rate of “ growth. 
P.M. 
In water. 
438 ........- 476 
454 
440 ........... 384 
Water siphoned out. 
In air. 
Times of 
observation. 
P.M. 
DIPPPTIIEII 
...0000ner.. 
Rate of “ growth.” 
0:5 per cent. 
It will be seen that the acceleration produced by ammonia is 
extremely temporary; and in this its action resembles that of 
ether and alcohol. 
c2 
