292 REV. G. HENSLOW ON TRANSPIRATION 
The means of all four specimens will therefore be as follows :— 
R. Y. G. V. Cl. Dk. 
0305 "0267 "0285 ‘0300 ‘0370 ‘0267. 
These may be practically represented :— 
‘030 027 “028 . ‘030 *037 027. 
These results agree with those obtained from plants possessing 
chlorophyll, so far as the maxima occur under red, violet, and 
clear glasses, while yellow, green, and total darkness give 
minima. This result is almost as obvious in the means for each 
specimen respectively. 
If, however, we neglect third places of decimals, we may write 
the above thus :— 
03 03 03 ‘03 04 03. 
This result shows that the differences between the effects of 
any particular colour is really almost inappreciable ; whereas 
the augmentation under clear light is more pronounced. This 
last result, as mentioned above, was obtained by MM. Bonnier 
and Mangin. It should be observed that, taking high places of 
decimals (as the third or fourth), one runs the risk of appearing 
to emphasize what may be fictitious results. So far as they go, 
however, it is at least somewhat remarkable that they should so 
completely tally with the results obtained from green plants, 
where the differences are more manifest. 
Effects of Temperature. 
The mean temperatures from December 28, 1885, to January 
15, 1886, during which period the observations were made upon 
the specimens Nos. L, IL, and IIL, rose during the first four 
days, fluctuated from Jan. lst to the 4th, and then fell again. 
Grouping the total amount of losses per hour during these three 
successive periods, the results are as follows :— 
Mean Max. No. I. No. II. No. III. 
Dec. 28 to 31 ......... 439-5 *018 020 034 
Jan. 1 to 4 ............ 539-5 :026 023 *036 
Jan.5toFeb.15 ... 4390 -020 [decayed] ‘031 
Comparing the lossas per hour under the lowest minimum . 
temperature with those under the highest maximum, the effect 
under each glass is shown as follows :— 
