SECRETION OF DIASTASE BY PENICILLIUM CAMEMBERTII 249 
With the nitrates of potassium and sodium (Table VI) there is an 
increased growth which is greater in the KNO3 than in the NaNOa. 
We see, however, that with one exception — that of M/ioo,ooo NaNOs 
at the end of two weeks — the M/ioo,ooo concentrations decrease the 
actual amount of digestion, even though the amount of growth is 
increased in those concentrations. If the digestion per unit weight 
of fungus is considered, it is evident that the digestion decreases with 
increasing amounts of salt. 
It can also be observed here that with the exception of the M/iooo 
concentration, which might be accounted for by the great difference 
in growth in favor of the KNO3 culture, there is less digestion than 
in the corresponding strength of NaNOs. This is also evident in the 
digestion per unit weight of mycelium, in which the digestion per 
unit of dry weight in the M/iooo concentration of the two salts agrees 
with the general proposition. 
KH2PO4 and NaH^POj^. — In this series the fungus was grown in 
the presence of various concentrations of KH2PO4 or NaH2P04. 
The cultural conditions were as before noted. The results sum- 
marized in Table VII are the averages of triplicate cultures: 
Table VII 
KH^PO^ and NaH^PO^ 
Soluble Starch in 
Dura- 
tion 
in Days 
Original 
Starch Content 
(Mg. per 
20 Cc.) 
Starch Content 
after Digestion 
(Mg. per 
20 Cc.) 
Starch 
Digested 
(Mg.per 
20 Cc.) 
Dry 
Weight 
of Mycelium 
(Mg.) 
Mg. of 
Starch Di- 
gested per 
Mg. of Dry 
Weight 
M/iooo KH2PO4 
7 
i37-i± .1 
I02.8zb2.7 
24.3 
2.3±.I 
10.5 
M/io,ooo KH2PO4 
7 
I40.3± .2 
IQ7.9±2.2 
32.4 
2.7±.I 
12.0 
M/ioo,ooo KH2PO4 
7 
I39.7±i.6 
I04.7±i.i 
35.0 
2.2±.I 
15.9 
Water treated with 
carbon black 
7 
i34-3± -6 
100. 8±i. 
33.5 
2.0zfc.I 
16.7 
M/ioo,ooo NaH2P04. . . . 
7 
I40.9zb .2 
no. I ±2.2 
30.8 
2.2d=.I 
14.0 
M/io,ooo NaH2P04 
7 
139.8 
ioi.8± .8 
38.0 
2.3±.I 
16.5 
M/iooo NaH2P04 
7 
140.4 
io6.3± .5 
34.1 
2.4±.2 
14.2 
M/iooo KH2PO4 
14 
i37-i± -I 
8o.7±2.i 
56.4 
3.3 
I7.I 
M/io,ooo KH2PO4 
14 
I40.3± .2 
69.6± .5 
70.7 
3.i±.i 
22.8 
M/ioo,ooo KH0PO4 
14 
139.7^1-6 
74.1 ± .8 
65.6 
3.3±.i 
19.9 
Water treated with 
carbon black 
14 
i34-3± .6 
67.6± .8 
66.7 
3.3^.3 
20.2 
M /ioo,ooo NaH2P04 
14 
140.9 zb .2 
73.9± .5 
67.0 
3.4±.i 
19.7 
M/io,ooo NaH2P04 
14 
139.8 
70.6± .3 
69.2 
3.3±.i 
21.0 
M/iooo NaH2P04 
14 
140.4 
70.5±i.3 
69.9 
3.3 
21.2 
Analyzing the data given in Table VII, we note that M/iooo 
KH2PO4 is the only solution which produces marked decrease in the 
