562 
ADRIAN J. PIETERS 
levulose is especially adapted to the production of oogonia and that 
phosphate salts influence the number of oogonia produced to a greater 
degree than they do the increase in weight of mycelium. 
Table XVII 
Series IX. S. monoica. Mycelia Out of Culture Media in Column Two, Transferred 
to 0.05 Percent Haemoglobin After Seven Days' Growth, and Weighed After 
Growing Thirty Days in 200 cc. Solution. Weights in Milligrams. 
Sugars All 1/50 and Salts All 1/200 Molecular; Peptone 
0.1 Percent 
3 
No. 
Media 
Weight 
Sporangia 
Oogonia 
I 
Peptone + dextrose + KNO3 
.0423 
0 
41, oogonia small 
80 
2 
+ dextrose + CaNOs. .. . 
.0281 
0 
3 
+ levulose + KNO3 
•03675 
O-I 
93 
4 
+ levulose + CaNOg. .. . 
.02095 
o-I 
40 
5 
" + dextrose + KH2PO4 . . 
.2011 
O-I 
94 
6 
+ levulose + KH2PO4. . . 
.2084 
0 
79, large and well 
filled 
7 
+ dextrose + NaH2P04 . 
.13835 
0 
90, many small 
• ones 
8 
+ levulose + NaH2P04.. 
.I7H5 
O-I 
89, mostly small 
ones 
9 
" + dextrose 
+ Ca(H2P04)2 
.15954 
O-I 
no 
10 
+ levulose + Ca(H2P04)2 
.1093 
I 
93, large well 
filled 
II 
+ dextrose + KSO4 
.0291 
o-I 
12 
" + levulose + KSO4 
.01855 
Few 
13 
+ dextrose + MgS04. . . . 
.0404 
* 
14 
+ levulose + MgS04 
.02225 
o-I 
54 
15 
+ KNO3 
.0183 
Few 
16 
+ KH.PO4 
.0426 
III 
17 
18 
+ NaH2P04. 
.0401 
1 01, small 
" + Ca(H2P04)2 
.0416 
* 
19 
+ KSO4 
.0213 
68 
20 
+ MgS04 
.0276 
57, small 
21 
" 0.1% 
.0244 
48 
Experiments with Achlya prolifera 
Several sets of experiments were carried on with this species along 
the same lines as those before described. The results however were 
not satisfactory but are presented because so far as they may be 
accepted at all they seem to confirm most of the conclusions arrived 
at by a study of the previously considered species. The oogonia 
could not be counted as the mycelium was so thickly matted that 
many oogonia could be but dimly seen and the distribution of the 
