92 



EKV. G. HENSLOW O^^ THK 



3. Experiments withEooted Plants in Water for 2i hours unJcT 



eacli glass. Eange of temp. 57^~G1^ F. 



Enpliorhia. 



Colour. 



Y. . 

 G. . 



V. . 



CI. . 



# » 



« t « 



Total loss 

 .. 1-47 



.. 1-23 



'82 

 •75 



"72 



Walljlower. 



Colour. 

 R. 

 Y. 



a. 



B. 

 V. 



01. 



Total loss. 



... 1-91 

 .. 1-34 

 ... 1-34 



... -91 



■81 



Grass. 



Colour. 



E. . 



Y. . 



G. . 



B. . 



V. . 



CI. . 



Total loss. 

 .. 1-93 

 .. 1-91 

 .. 1-43 

 .. M8 

 .. 116 

 .. 1-30 



Ha dish. 



Colour. 



R. . 



Y. . 



G. . 



B. . 



V. . 

 CI. 



Total loss 

 .. 1-13 

 .. Ill 

 .. 1-03 



. . -St; 



.. -91 



... -99 



In these exninples, excepting tlie last one, tlie loss steadily 

 decreased from R. to Y., shewing no maxima, as already stated. 

 The last one alone shows an iucreaise under violet as well as 

 clear glass, which may perhaps be accounted for by the suc- 

 culent nature of the root, as already suggested. 



4. Experiments for Longer Periods. — I selected six young 

 Lettuce plants on May 15th and May 23rd, 1883, respectively, 

 from a hed and transferred them to miniature pots. They were 

 allowed to become well established, and then the pots were com- 

 pletely invested in gutta-percha sheeting as described. Each 

 plant was placed under the coloured glasses in succession for -* 

 hours, with the following results (loss in grammes) : 



Mean Temperature 61;°, 



Kg. of 

 Pot. 



R. 



Y. 



G 



I 



II. 



Ill, 



IV. 



V. 



VI. 



109 

 •(51 



1 •or> 



1-43 

 Ml 

 1-39 



116 



•07 

 ]-16 



lOo 

 1 09 

 1 62 



1 Ol > 



•5.5 

 J. 22 



116 



•89 

 1-48 







r — — F 



V 



r 



V 



B. 



4 



V. 





1-29 



r 



1-47 



1-29 i 



•72 



•95 



•61 



1-25 



1 



2^ 1 6 



•63 



116 



1-92 



\-T2 



1-02 



1-48 



113 



121 



175 



1-50 



L 



Totals... 



6GS 



615 



6-36 



iJC>: 



9-73 



6-88 



The temperature during the six clays occupied with tins experi- 

 ment varied only eight degrees, from 56° to 64"^ F- ; and to snoW 

 hoTF little this affects the results, the temperature for pot I. under 



