9G 



REV. G. HENSLOW ON" THE 



Totals 



No. II. 



R. 



1 



Y. 



1 

 1 



•93 



G. 



1 



1-10 



B. 



•80 



V. 



•79 



CI. 

 1 ^45 



•93 



1-74 



■92 



•7r> 



•88 



•74 



I -Do 



•61 



•.^0 



•87 



•69 



•72 



■89 



•47 



•54 



•48 



•34 



•71 



•77 



•92 



•35 



•56 



roi 



3-72 



•63 

 3-59 



•32 

 4^48 



4-67 



1 



3-24 



377 



1 



No. III. 





B. 



■60 



Y. 



•53 



a. 



•60 



B. 



•70 



V. 



•50 



CI. 





•97 





•64 



•69 



•47 



•79 



•70 



•58 





•47 



•46 



•63 



•77 



•39 



•73 





•34 



•36 



•41 



•41 



•37 



■45 





•54 

 2-59 



1 



•44 

 2-48 



■32 

 2^43 



» i 



■48 

 315 



•43 

 2 39 



•62 



Totals 



335 





Mean of the three totals : 



3-83 



3-38 



3-31 3-56 



341 



4^12 



A result much the same as in the case of the Lettuces. Ked, 

 blue, and violet rays give manifest maxima ; yellow and green 

 minima; while clear jields the highest maximum of all. 



These experiments with the Palms show the necessity of 

 making a prolonged series with the same plants ; for the totals 

 for No. I. taken alone would lead us to suppose that the yellow 

 glass was most favourable of all the colours ; but variations of sun- 

 light, coupled with slight variations of temperature, may account 

 for it. Thus, when the yellow glass gave a loss of "97 gramme, 

 and red only "70, the temperature ranged from 63° to 66^ "vvith 

 the former, aod only from 61° to 64^ with the latter on June 28, 

 1883. Again, yellow gave a loss of '88 gr. on July I6tb, with a 

 temperature ranging from 57° to 62"^ ; but on the day before 

 the red glass gave a loss of '75, while the temperature ranged 

 from 59° to 64°; hence, in all probabilit}', it was a duller 



day. 



These irregularities, however, become eliminated when so large 

 a series of observations as eighteen for each colour are taken ; for 



