Temper attire on the Rate of Growth in Pistim sativum. 37 
The meaning of the results may be summarized thus : The rate of 
growth in the first ten minutes at 3*30° is the highest rate obtained ; in the 
first half-hour it falls rapidly to a mini- 
mum, and thereafter a recovery takes 
place, giving a second maximum in the 
fourth half-hour. After that the rate falls 
uniformly and rather slowly, being about 
two-thirds of its initial value after eight 
hours. 
At 35 0 the course of events is similar, 
but the rise and fall are steeper. Here 
readings were taken in the five minutes 
which the temperature takes to rise from 
about 30° to 35 0 . These gave a mean 
value of 0*33 in five minutes, or o*66 in 
ten minutes, in contrast to 0-38 in the 
next ten minutes. It is to be noted that 
this is nearly equal to, but lower than, 
that in the first ten minutes at 30°. 
At 40° things are again entirely dif- 
ferent : here the rate falls uniformly and 
rapidly, showing no recovery. Here also 
readings were taken in the five-minute 
Text-fig. 9. Half-hours. 
