94 Church. — The Polymorphy of 
marked differences of light or food-supply there can be 
at the two equinoxes. Thus, the two stages of germination 
were carried out in similar vessels, in the same window, at 
a laboratory temperature varying from i2°-20°, although 
the average was nearer 14 0 for the spring and 18 0 for autumn, 
and in similar water, in which, as it was not changed, similar 
gas-conditions must have obtained. Apparently the only 
factor which varied was that the Aglaozonia-p\a.nts had been 
resting throughout the winter at a temperature of 8°~9°, 
and were in April reproducing on the spring rise to 12°, 
while the Ctitleria- plants were vegetating and reproducing 
throughout July and August at 18 0 . But although they 
continued to discharge oospheres on into the autumn at 
1 4°, and possibly at less than 12° in November, the par- 
thenogenetic oospheres all gave true foot-embryos, without 
exception. As far as present data go, therefore, it would 
appear that inherited characters may play a certain part; 
but it has not yet been established that heredity has attained 
such a degree of importance in the life-history that any 
alternation is inevitable, much less sexually beneficial. Sum- 
ming up these data, it remains shown that : — 
] . Cutleria oospheres, whether fertilized in the Mediterranean 
(Falkenberg), presumably or actually parthenogenetic 
in the autumn in the English Channel, developed a 
foot-embryo, which resulted in definite Aglaozonia- 
thallus and nothing beyond. 
2. Aglaozonia zoospores produced a recognizable Cutler ia- 
form, presenting all the essential characters of a Cutleria- 
thallus with the exception of the fasciation of the 
branches (protonematoid embryo —C. multifida var. 
confervoides Kuckuck), — and under adverse conditions 
(since the plants died) producing antheridia in great 
numbers ; but also true Aglaozonia- discs. 
3. Cutleria oospheres, germinated parthenogenetically by 
Thuret, under conditions not described, gave a true 
protonematoid embryo, which if it had lived would 
have undoubtedly given a Oitleria plant. 
