1917] 
DUGGAR—FUNGI IN PLANT DECOCTIONS 171 
the curves exhibited in figs. 1-4, these representing all four 
organisms on four of the decoctions, namely, bean, sugar beet, 
prune, and potato, the data for turnip decoction being omitted 
merely (a) because it follows very closely in three of the fungi 
БЕНЕН НЕНІ ӘНІН 
Es 7 7 V А W 
Fig. 3. Glomerella Gossypii; dry weights of cultures in mg. on ordinates, 
solutions (see p. 166 for explanation) on abscissae. Key to graphs i in fig. 1. 
the curves of the prune decoction, (b) because it would further 
have complicated the diagrams, and (c) because on the whole 
it is much less used as a culture medium. 
Some of the interesting features of the curves in general 
are these: 
The addition of sugar, nitrate, and phosphate gives in every 
ease except one (Glomerella on bean decoction) increase in 
growth over the addition of sugar alone. In the majority of 
cases the next highest growth occurs when sugar and nitrate 
are added. The addition of sugar alone gives a relatively 
slight increase over the natural decoction, although it is to 
be remembered that where sugar or other nutrients are 
added the decoction is diluted one-half. In Aspergillus the 
addition of sugar and phosphate gives a slight increase over 
the addition of the same concentration of sugar alone. In 
