at different periods of the Day. 259 

 Rate of growth under the highest Temperature. 



Here we have no intelligible result, but the testimony is just as 

 conflicting as in other cases. It is true that both the Hop and 

 Vine were constantly above their average when exposed to the 

 highest temperature, and at all periods of the day; that both these 

 plants and the Sweet Willow and Fig, acquired their maximum 

 night growth under those circumstances ; that the Gourd also gained 

 its greatest afternoon increase on one occasion of the highest tem- 

 perature. But, on the other hand, while on one occasion a night 

 temperature of 65J gave the Willow its maximum growth, another 

 night temperature of 66 J° resulted in .04 below the average ; in- 

 deed the Willow was below the average in 4 out of 6 instances of 

 highest temperature. Then we find the Scarlet Runner always 

 below the average at night at the very moment when others were 

 acquiring their maximum ; and in the case of the Gourd, winch 

 was exposed to an afternoon temperature of 67i°for three successive 

 days, although on the first day it acquired its maximum, yet on the 

 2nd day afterwards it had fallen so low as .17 above the average, 

 the circumstances remaining to all appearance the same. 



