RELATION BETWEEN VEGETATIVE VIGOR AND REPRODUCTION 553 
for the purpose of illustration. Differences as great as between 
28 and 41 might well be found between two counts of the same dish, 
but no two duplicate dishes would, without contamination or other 
accident, show as great a difference as that between 28 and 53. 
While the upward trend in the number of oogonia, with the in- 
crease in the food furnished, is evident, there is no corresponding 
increase in the weight of mycelium. It will be noted also that the 
amount of increase in the weight of mycelium between seven and 
forty-eight days is by no means uniform and a study of this feature 
brings out a rather interesting point. In Table XII these data are 
arranged in the order of the increase in weight of each mycelium due 
to the growth from the seventh to the forty-eighth day. 
Table XII 
Series I, S. ferax. Record of Table X A r ranged in the Order of the Increase in Weighty 
Due to Growth Between Seven and Forty-eight Days 
I 
2 
3 
4 
5 
Record 
Amount- 
Weight 
Weight 
Number of Oogonia 
Number 
Increase 
7 Days 
48 Days 
7 
Xl.85 
.0054 
.010 
28 ' 
6 
X2 
•0035 
.007 
18 
^ Group 1. Average number of oogonia 
2 
X2.5 
.002 
.005 
16 
29. Average excluding No. 8 — 21. 
8 
X2.5 
.0054 
.013 
53 J 
II 
X3 
.0023 
.007 
28 1 
10 
X3.3 
.002 
.0066 
36 
, Group II. Average number of 
3 
X3.3 
.003 
.Oil 
30 
oogonia 36. 
9 
X3.3 
.006 
.020 
51 J 
8m 
X7 
.005 
.036 
43 ^ 
6m 
X7.5 
.0044 
•033 
41 
^ Group III. Average number of 
7w 
X8 
.004 
•033 
42 
oogonia 47. 
9w 
X9 
.005 
.044 
50 J 
Of the first group, those showing an increase in weight of not 
more than 2.5 times, number 8 is the only one credited with a large 
number of oogonia; of the second group number 9 is credited with a 
much larger number of oogonia than the others. The third group 
differs strikingly in the much greater increase in weight shown by all 
the mycelia. Reference to Table X will show that the culture medium 
for all those in group III contained mialtose, and that this group in- 
cludes only those in which maltose was added to the culture medium. 
The record of numbers 2 and 6 may be compared since in both 
cases 0.1 percent peptone was available, but sucrose had been added 
