Apr. 15, 1920 



Effect of Solution Reaction on Germination and Growth 79 



fore not reported separately. The green weights obtained for tops, roots, 

 and entire plants, exclusive of seeds, are given in Table II. The average 

 reaction of each culture at the beginning and at the end of the 4-day pe- 

 riods and for the entire 1 6 days is also included in the table. The relative 

 total green weights, based upon the highest, taken as 100, are shown in 

 figure 3 plotted against the average Ph of the solutions, and the appear- 

 ance of the seedlings at time of har\"esting is shown in Plate 15, A, B. 



"^ s e 7 a 



React/on as P^ 



Fig. 3. — Graph showing the relation of growth of wheat seedlings to reaction in series A. 



Table II. — Average reaction of cultures in series A and green weights of plants grown 



for period of 1 6 days 



Culture No. 



Average reaction of culture. 



Before 

 growth. 



I 

 2 



3 

 4 

 5 

 6 



7 



3.18 



3-44 



4. 22 



5. 26 



6. IS 

 6.61 

 7.28 



After 

 growth. 



Pn- 

 3-29 

 3.80 

 5.10 

 7. 02 

 7.21 

 7.24 

 7-34 



Entire 

 period. 



Green weight of 10 plants. 



Tops. 



Gm. 



0. 410 



I- 345 

 1.440 



•570 



•737 



1. 087 



1-375 



Roots. 



Gm. 



o. 049 



.079 



. 204 



.049 



.091 



.171 



■33^ 



Entire 

 seedling. 



Gm. 

 0.459 

 1-425 

 1.644 

 . 619 

 .828 

 1.258 

 I. 706 



