298 REV. G. HENSLOW ON TRANSPIRATION 
is a remarkable coincidence that MM. Bonnier and Mangin 
found that the luminous rays, especially red and yellow, retarded 
respiration, other conditions being equal*. 
Effects of Temperature. 
Comparing the losses per hour under the lowest minimum 
temperature with those under the highest maximum, the effect 
under each glass is shown as follows :— 
Lowest Highest 
min. | No. I. | No. II. eax, No. I. No. II. 
o : : o 
R. ...... 39 041 070 59 051 084 
Y. ...... 40 034 065 58 028 026 
(C ...... 44 030 083 56 036+ *080t 
V. ..... 40 034 | 070 59 053 087 
CL ...... 50 031 079 59 051 ‘090 
By comparing these results, it will be seen that increments of 
temperature generally increase markedly the transpiration. A 
curious exception is noticeable with yellow light, in which 
an increase of 18° is accompanied by a decreased power of 
transpiring. Somewhat similar results seem noticeable with 
Mushrooms 1. 
With regard to the effects of temperature apart from light, 
if we group the means in successive increments as follows, the 
effect is clearly seen. 
The following figures represent the loss per hour at night 
iu total darkness :— 
dua ` L IL 
arch 16.................. 40:5 4 4 
Mn 425) see: 03 06 
BAB ROREM 5 
"o ne 44-0 fo 03 07 
ln 50-5 
"o Ms 505 | e 03 07 
un 52-5 
2 BOE 52:5 } eet 04 07 
lo 545 
” PA Vor 550%... ‘03 08 
en 55-5 
len 565 ese. 09 
a — 57-0 
DEN 57-0 
Kar RR BrB to 04. 08 
MD E conu 57:5 
* “La Fonction Respiratoire chez les Végétaux.” Ann. des Sci. Nat. tome ii. 
p. 377. 
t Means of two observations. 
1 See the corresponding table p. 293, especially Nos. I. and II. : 
