156 
AMERICAN JOURNAL OF BOTANY 
fVol. 8 
Ca (1103)2 
R4 
Fig. 3. Triangular diagrams showing relative yields from cultures of series i to 3 
(group i). Areas of low yields lie on the eft margins of the diagrams, medium yields in 
the central regions between dotted lines, and high yields at the lower right of each diagram. 
