37° 



BOTANICAL GAZETTE 



[OCTOBER 



B 



It is more suitable for our 

 present purpose to employ a 

 square as the base and to 

 represent the composition of 

 the solutions according to the 

 scheme shown in fig. 2. In 

 this figure the abscissas have 

 the same significance as in 



%• 



1 



while the ordinates 



represent various dilutions of 

 the mixtures. Thus all 

 points on the line CD repre- 

 sent distilled water, while a 

 point such as E, halfway 

 between A and C, represents 



a 



mixture containing equal 



quantities of distilled water 

 and of A o. 1 M. The points 

 on the line EF, therefore, 

 represent the same mixtures 

 as the corresponding points 

 on the lowest line, except 

 that the concentrations are 

 in all cases just one-half as 



great as those repre- 

 sented on the base line. 

 It is evident that the 

 growth in any concen- 

 H 2 tration may be ex- 

 pressed by erecting at 

 the proper point a line 



perpendicular 



to the 



plane of the paper. In 

 this way we may obtain 



*S£tta JS^Jss; a soUd model whi . ch gives „ a 



the form of the. anfaannicm mM . u„ ^ • _ _ comnlete desc.rintion of the 



the concentrations of the solutions. 



complete description of the 

 changes in growth produced 



