Journal of Agricultural Research 



Vol. V. No. 



Five determinations were made of the plants in each glass, making about 

 18,450 separate determinations. This number was reduced somewhat 

 by the fact that plants did not germinate in all the glasses, owing to the 

 high salt content. With this great number of results it is impracticable 

 to give all the data in detail; hence, only summaries will be presented. 



COMBINATION OF SALTS 



In each test containing 15 glasses three different salts were used. 

 The glasses were arranged in the triangular diagram used in expressing 



SODIUM CHLORID 



SODIUM SULPHATE 



Fig. I.— Diagram showing percentage of salts, mixtures, and their position i 

 sets. The arrangement ol salts shown here is that in figure 2, page 14, 

 different salts apply to figures 2 to 25. 



hSODlUM CARBONATE 



1 the diagrams of experimental 

 The same positions but with 



three variables. This arrangement is shown in figure i, the salts in 

 this case being sodium sulphate, sodium carbonate, and sodium chlorid. 

 All 15 glasses contain the same total concentration of salts — for example, 

 in figure i the concentration is i ,000 parts of salt per million parts of 

 dry soil. 



The glasses on the corners of the diagram which are marked "A," " E," 

 and "O" contained 100 per cent of the single salts. The other glasses 



