May, 1921] 
KAUFFMAN — ISOACHLYA 
Fig. 7. After the end of the first swarming stage, a. Empty spore walls, b. Escaped 
but quiescent, naked cells, c. Act of escaping of cell. d. Germination by one or more 
germ tubes, the second "swarming" being omitted, 
Plate XIV 
Fig. 8, a. Two examples of oogonia with mature oospores, h. A single mature 
oospore, much enlarged. After thirteen days. 
Fig. 9. One of few occurrences of an oogonium with antheridia. Antheridia nearly 
mature; oogonium young. After 8 days. 
Fig. 10, a-c. Oogonial arrangement in solution of haemoglobin 0.05% + KNO3 0.1%. 
Note the larger number of oospores per oogonium. After four days. 
Fig. II, a~c. Oogonial arrangement in solution of haemoglobin 0.05% + levulose 
0.12%. After twelve days. 90% of oogonia occur in pairs. 
Fig. 12, a~c. Oogonia arranged singly at ends of long stalks, frequently with vege- 
tative outgrowths below the oogonium, and oospores rather numerous. From culture in 
0.1% leucin. d. In 0.02% leucin. In this weaker solution the] inhibitive effect of leucin 
for the torulose arrangement is reduced. Both after ten days. 
Fig. 13, a. In 0.02% peptone, after five days. b. After ten days. The oogonia are 
unable to mature in this solution. 
Fig. 14. From peptone cultures in condition shown by figure 13, washed in distilled 
water for an hour, then transferred to distilled water. The initials become zoosporangia 
and the zoospores have escaped. After twenty-four hours. 
Fig. 15, From culture in 0.02% peptone, a. Note regular arrangement of the basal 
walls of sporangia, b. Neat illustration of the doctrine of homology of different organs of 
reproduction. One of few oogonia which produced oospheres in this solution, c. An 
oogonial initial becoming a zoosporangium with scarcely any external morphological change. 
