GROWING PLANTS UNDER GLASSES OF VARIOUS COLOURS. 73'' 



Col. 2. The amount of dry substance obtainable if the per- 

 centage had remained at 10 (Table I. col. 1 -f- 10). 



Col. 3. The differences between the amounts of dry substance 

 actually obtained and calculated above (col. 1), and what it would 

 have been supposing it had remained at 10 per cent. (col. 2 ^ 

 col. 1). 



Col. 4. The percentage of dry substance actually obtained and 

 calculated as above in col. 1. 



Col. 5. The loss or gain per cent, between the initial 10 per 

 cent, and the final percentage of dry substance (10 less by 

 col. 4, or vice versa). 



Col. G. The differences between the amounts of dry substance 

 (col. 1) and the maximum obtained by plants grown in the open 

 (viz. 8-63 grs., col. 1). 



(1) (2) (3) (4) (5) (6) 



gii 5 . JO'S. grs. yi.c. p.c. grs. 



B 1-85 263 -078 7 1 -2-9 -6*78 



Y 3 18 4-35 -1 17 7 3 -2-7 -5-45 



G 0-83 1-57 -0 74 5 3 -4 7 -7*80 



B 2-64 2-49 +0-15 10 0 +0.0 -5 99 



CI 5-19 4-47 +0 72 110 +1-0 -3 44 



Open 8-03 0-73 + l-'JO 12-5 +2-5 



Table III. (Water). 

 Col. 1. The calculated amount of water in the final stage in 

 grammes. 



Col. 2. The amount of water calculated on the basis of 90 per 

 cent., i.e. in the initial stage.* 



Col. 3. Gains or losses between the preceding (col. 1, less by 

 col. 2, or vice versa). 



Col. 4. The percentage of water from the calculated amount 

 in col. 1. 



(1) (2) (3) (4) 



^rs. grs. grs. p.c. 



E 24-45 23G7 + -78 92-9 



Y 4032 39-15 + 1-17 92-7 



G 14-87 14-13 + -74 94-7 



B 22-20 22-41 - -15 89'4 



CI 39-51 40-23 - -72 88-4 



Open 58-07 00-57 -1-90 87-5 



I will now make some observations on these results. 



The first to be considered is red glass, which shows, after 

 green, the least amount of dry substance in plants grown under 

 it ; this being the test of assimilative powers. 



* Thus, e.g. (Tab. 1, col. 1, E.) 20-3 + 9 -:- 10 = 23-07 grs. 



