ON THE INFLUENCE OF DIFFERENT RATIOS OF LIME. 363 



II. Influence of Varying Mixtures of Lime and 

 Magnesia salts upon Wheat in the Absence 

 of Other Mineral Nutrients. 



In these experiments mixtures of calcium and magnesium 

 nitrate were prepared in such proportions that the following- 

 ratios between lime and magnesia were obtained : 



a. 0.3 



b. 0.6 



c. 1 



d. 2 



CaO MgO 

 1 



e. 



f. Control in dist 



1 

 I 

 1 

 I 



lied water. 



The concentration of the culture solutions was 0.2%. In 

 100 c.c. of these solutions were placed wheat shoots on Novem- 

 ber 15th. It was soon noticed that in the solutions (c) and (d), 

 the plants were developed much more vigorously than in (a), (b) 

 and (e), and in the control case with distilled water. In (c) and 

 (d), the leaves were longest and the branches most numerous. 



On November 30th, a photograph was taken, (see plate 

 XLII.) Although this experiment was now terminated, it had 

 sufficiently demonstrated the great influence of different ratios 

 of lime and magnesia. Further development would of course 

 soon have ceased, since the solution applied contained neither 

 sulphates nor phosphates nor potassa. The results obtained are 

 seen in the following table: 



