10 MISS A. BATESON AND MR. F. DARWIN ON THE EFFECT OF 
Exp. 7 (continued). 
Times of observation. Rate of “ growth.” Temperature. 
P.M. . 
12.205 ................. Siphoned out water. 
12215 ................ 4 per cent. spirit in. — 17:5 
1222  ............. 256 » 
12:225 ..... seen 196 " 
200 » 
12298  ................. 153 - 
12235 une 138 » 
12239 ............... 133 » 
1234 eee eee 125 » 
12255 ............ e 105 
Result with 4 per cent. methylated spirit: acceleration 100: 180. 
Exp. 8.—Sept. 7, 1886. Jerusalem-Artichoke pith. 
Times of observation. ` . Rate of “ growth.” Temperature. 
P.M. . 
BBO nike Tap-water (370 c. e.) 19 
$525.54. eh 204 » 
196 T 
S58 sb ike 166 - 
129 » 
108 " 
BAND: dioses lang 100 » 
WORD. <i ectagectcstevess 89 » 
3.58 89 i 
$58 E E E 4:3 per cent. spirit. 20 
333 ” 
BIO eee 285 » 
250 ” 
S503 eiieeii 200 " 
RO EN ri 200 » 
Sl. ogo ean dees 166 n 
BED use 144 " 
SUM eie 138 
Result with 4'3 per cent.: acceleration 100 : 375. 
It will be seen that in these three cases the acceleration is only 
temporary, the rate begins to fall after a sudden rise. 
A number of experiments were made on the effects of 
alcohol, the results of which agree with those already given; that 
is to say, a temporary and variable amount of acceleration is pro- 
duced. The temperature of the water was not noted in all cases ; 
but we satisfied ourselves that the acceleration is not to be 
accounted for by the slight rise in temperature which follows the 
mixture of the spirit and water. Experiment 7 shows clearly that 
a great acceleration occurs, even when the temperature is made 
to diminish, on the addition of alcohol. 
The following experiments give some notion of the percentage 
