200 Journal of Agricultural Research voi. xxi, No. 4 
Tabi,H VI .—Grams of glucose reduced for each gram oj dry weight formed —Continued 
Series 
No. 
Percentage 
of dextrose 
by weight. 
Solution. 
Sclerotium 
bataticola. 
Penicillium 
sp. 
Botrytis 
cinerea. 
Sphaero- 
nema fim- 
briatum. 
I 
f Control . 
O 
iTnomlated. 
O 
0 
0 
O 
II 
f Control . 
IO 
1 Tnnruljitprl . 
5. 02 
3 - 58 
2. 68 
III 
f Control . 
20 
1 Tnoriilatpri . 
4 - 59 . 
2. 70 
2. 07 
IV 
f Control . 
30 
1 Tnnpiil nfprl . 
3 * 39 
2.93 
4 - 56 
f Control . 
V 
40 
1 Tnnmlntprl . 
3.86 
5 - 2 3 
5-82 
VI 
f Control , . 
50 
2. 98 
3*05 
VII 
60 
f Control .. 
1 Tnnr»ii1ntpr1 . 
8.6l 
In the same concentration of sugar the different organisms varied 
greatly in the amount of glucose required to produce i gm. of dry weight. 
Likewise the amount required to produce i gm. of dry weight of the same 
fungus differs greatly with the concentration of the solution. For ex¬ 
ample, Fusarium acuminatum required a little over 6 gm. of glucose to 
make i gm. of dry weight in an approximately 40 per cent solution. On 
the other hand, in a 10 per cent solution over 17 gm. were required, or 
nearly three times as much. In other words, the higher the concentra¬ 
tion the smaller the amount of glucose used to form 1 gm. of dry weight. 
Within the limits of these experiments the “economic coefficient” of 
F. acuminatum in a 40 per cent solution would be 6.38. Diplodia tuber - 
icola forms a curve similar to that of F . acuminatum f but the quantity of 
glucose required to produce 1 gm. of dry weight is considerably less in 
corresponding concentrations of the solution, its “economic coefficient” 
in about the same concentration being 2.13. Rhizopus tritici reverses 
the process, the lowest “economic coefficient” of 3.70 being in an approx¬ 
imately 10 per cent concentration. In a 50 per cent solution the same 
fungus utilized 17.67 gm. of glucose to produce 1 gm. of dry material. 
If R. tritici is compared with Mucor racemosus t which required 1.44 gm. 
of sugar to produce 1 gm. of dry weight, it is seen that the order is again 
reversed, the lowest “economic coefficient” occurring in a concentration 
of 50 per cent. The highest “ economic coefficient” of the latter organism 
was in a 28.7 per cent solution and increased both above and below this 
concentration. Sclerotium bataticola parallels M. racemosus and in every 
case except in a 50 per cent solution requires much less sugar to form 
1 gm. of dried material. Neither Penicillium sp. nor Botrytis cinerea is 
quite consistent, in that the minimum glucose required per gram of 
dry weight is not at either end of the series. 
A comparison of the maximum amount of glucose required to form 1 
gm. of dry weight shows remarkable variations among the different 
