STIMULATION ON TURGESCENT VEGETABLE TISSUES. IL 
of alcohol necessary to produce acceleration. In these cases 
absolute alcohol was used instead of methylated spirit. 
Acceleration produced Fig. 3. 
by— 570 
2 per cent.... 100 : 122 
2 ,  .. 100:105 
15 , ... 100 : 108 550 
15 , ... 100: 172 
No effect produced by— 530 
1:5 per cent. 
1 » 510 
1 ” 
05 , 
We may conclude that 1°5 "m 
per cent. of absolute alcohol 
is about the critical point; 470 
while strengths greater than 
this can be trusted to pro- 
duce acceleration, those 
lower can be trusted to pro- 
duce no effect. The fact 4 
that alcohol produces a 
sudden acceleration in rate — 4 
of increase may be simply 
shown by a different method. 
If à Dandelion flower-stalk 
is split, each half curls up 
into a helix. Ifnowaslight 2% 
weight is attached to one 
end of the helix, it may be 
made to hang in a vessel of 
water, when the weighted 
end will revolve with more | 
or less rapidity. If an index 440 — 445 — 450 4.55 
is fixed to the weighted end TIME P.M. 
of the spiral, and a graduated Diagram: Effects of Alcohol. 
scale applied round the vessel, any diminution or increase in 
the rate of revolution can be easily measured. With such an 
apparatus we have repeatedly observed a marked increase in the 
rate of revolution when alcohol is added. 
GROWTH. 
& 
S 
390 
350 
