J6 4 



K. ASO. 





Length of the longest leaf. 



Number 



nf 



or 

 leaves. 



Number of 





Nov. 15. 



Nov. 30. 



branches. 



a 



cm. 

 16.5 



cm. 

 17-5 



5 



2 







b „ 



18.0 



20.0 

 21.0 



6 



2 



c 



18.5 



1 1 



3 







d 



'7-5 



19.4 



10 



2 







e 



1S.2 



20.5 

 18.5 



9 

 4 



2 



Control 



i8-3 



1 



This proves that the ratio CaO : MgO as 1 : 1 (c) was the 

 most favorable for young wheat plants. 



III. Cultures of Barley in the Presence of all 

 Mineral Nutrients. 



The standard solution contained : 



KH 2 PO, 0.1% 

 Xa 2 SO, 0.1% 

 FeS0 4 trace 



The amounts of lime and magnesia varied here in the same 

 manner as in the case just described ; they were also added in 

 form of the nitrates, and the ratios were also designated here as 

 in the former case by a, b, c, d, e. 



But while in the former case with wheat the experiment 

 lasted only 15 days and the culture solution was incomplete, 

 this experiment lasted 90 days and the culture solution was 

 complete. 



On January 21st, two barley shoots were placed in each of 

 these solutions ; on February 27th, March 18th, and April ist, 

 the solutions were renewed. On March 22nd, the tips of the 

 main leaves in (a) had dried up; gradually these leaves also 

 became yellow and withered. The proportion in the seeds is on 

 the average, CaO : MgO as 1 : 3.3. It might naturally be ex- 

 pected that the influence of the mineral matter that had been 



