May 16, 1921 Glucose as a Source of Carbon for Storage-Rot Fungi 205 
acuminatum decreased the osmotic concentration in Czapek’s modified 
nutrient solution without sugar added more than any of the other 
organisms. Sclerotium bataticola and Botrytis cinerea decreased the 
concentrations in all except 40 per cent solutions, where there was a 
slight increase. The decrease in the osmotic pressure is especially 
marked with S. bataticola and Penicillium sp. in the 10 per cent solution, 
being reduced in the former from 16.12 to 9.31 atmospheres and in the 
latter from 16.48 to 6.26 atmospheres. 
Tabi,E VIII .—Osmotic pressure of the sugar solutions 
[Expressed in atmospheres] 
Series 
No. 
Percentage 
of dextrose 
by weight. 
Solutions. 
Fusarium 
acumin¬ 
atum. 
Diplodia 
tuber icola. 
Rhizopus 
tritici. 
Mucor 
racemosus. 
f Control . 
2. 41 
1-93 
16.37 
17. 24 
2. 17 
2 . OI 
i -93 
1. 81 
2. 29 
2. 29 
16. 84 
19. 04 
35 - 75 
39 - 53 
59 - 30 
63- 5 2 
93-85 
98. 51 
I 
0 
[Inoculated. 
II 
fControl. 
16. 24 
12. 52 
33-36 
3I.O9 
53-37 
53 - i 7 
92.20 
9 2 - 59 
16.36 
14. 44 
34 - 79 
32.41 
62. 03 
5 8 - 2 7 
98. 12 
95- 6 4 
IO 
\ Inoculated.. 
III 
/ Control.' 
20 
[Inoculated. 
IV 
f Control . 
66. 76 
68. 73 
IOI. 46 
101. 89 
30 
[Inoculated . 
V 
f Control . 
40 
[Inoculated . 
VI 
/ Control. 
50 
[Inoculated .. 
VII 
60 
f Control . 
[Inoculated . 
Series 
No. 
Percentage 
of dextrose 
by weight. 
Solutions. 
Sclerotium 
bataticola. 
Penicillium 
sp. 
Botrytis 
cinerea. 
Sphaero- 
nemafim- 
briatum. 
f Control . 
2. 17 
2. 13 
l6. 12 
1-93 
I. 67 
16. 48 
6. 26 
i -93 
1. 89 
i 5 - 76 
14. 84 
33-36 
3 i -45 
58. 00 
54-75 
90. 68 
i -93 
1.85 
15. 88 
15.96 
33 -60 
33 - 7 2 
52. 06 
52 . OI 
8l. 62 + 
I 
O 
[Inoculated . 
II 
/ Control. 
IO 
[Inoculated. 
9 - 3 1 
33 - 9 6 
30.89 
55 - °3 
54-04 
87.98 
90 . 92 
III 
/Control. 
34.68 
27. 86 
58- 47 
48. 02 
8l - 33 
80.39 
20 
[Inoculated.. 
IV 
/Control. 
30 
\ Inoculated. 
V 
/Control. 
40 
[Inoculated. 
92. 12 
VI 
/Control. 
50 
\ Inoculated. 
VII 
60 
/Control. 
[inoculated. 
Why some organisms increase and others decrease the osmotic concen¬ 
tration of the solution is not definitely known. It is difficult to explain 
why an organism decreases the osmotic pressure in all strengths of the 
sugar solution except in the 40 per cent and there slightly increases it. 
In this connection Sclerotium bataticola and Botrytis cinerea should be 
especially noted. 
36732°—21 - 2 
