26 The Philippine Journal of Science wn 
growing species than Absidia caerulea and with it A. caerulea 
made a poorer growth than with any other single fungus. The 
Coprini finally produce a very rank growth, but at first are slow 
growing, which would seem to account for the fact that with 
them Absidia caerulea made a better growth than with Mucor 
racemosa. Owing to the slight difference in the appearance o:P 
the various fungi it is difficult to compare the total amount of 
hyphae in the flasks but it is doubtful if this varied far from 
the average in any of them. 
These cultures of Absidia caerulea alone and with the other 
fungi show quite clearly that there may be a sharp competition 
between the various fungi growing in succession on dung, but at 
the same time they show equally clearly that this competition 
cannot explain the behavior of this mold on unsterilized dung. 
Another series similar to that last described was run in 
duplicate in 450 cc Erlenmeyer flasks. The results appeared to 
be in every way similar to those just described except that the 
fungi were less vigorous in the 450 cc flasks than in those holding 
600 cc. This difference in vigor was probably connected with 
the amounts of food and air available in the two size's of flasks. 
The experiments already reported having apparently proved 
that the early disappearance of Absidia caerulea in unsterilized 
cultures could not have been due to the presence of the other 
fungi considered, it remained to be seen if the same thing would 
hold for Mucor racemosa. On the 14th of March fourteen 600 cc 
flasks, containing dung, were prepared as described in the ex- 
periments with Absidia caerulea, two being kept as checks and 
12 sterilized.. The checks showed a succession similar to that 
described for other unsterilized cultures. This consisted of 
mucors followed by Oospora and this in turn by Copnni. The 
growth of the mucors and Oospora was very scanty and disap- 
peared completely in nine days. 
The sterilized flasks were inoculated in duplicate as follows: 
1, Mucor racemosa; 2, M. racemosa and Absidia caerulea; 3, 
M. racemosa and Oospora sp.; 4, M. racemosa and Coprinus 
stercorianus ; 5, M. racemosa and Coprinus plicatilis; 6, all of 
the five just mentioned. The results obtained were quite similar 
to those given in the case of Absidia caerulea. 
The mucors and Coprini commenced to grow immediately and 
in three days had made a vigorous growth. As in the cultures 
of Absidia, the growth of Oospora did not become visible as 
soon as the other fungi, probably owing to its small size. The 
mucors apparently reached their maximum development on the 
