- 79 — 
The antheridia appear much the same as on the earlier dates, the an- 
therozoids not having been shed. 
Material collected June 25 showed antherozoids still unshed and 
new antheridia forming near the tip. No archegonia in any stage 
were found in this material. 
June 28 found the plants in much the same condition as before. 
The archegonia show no special advance and the antherozoids still 
seem to be unshed. Only the involucres seem to have made any ad- 
vance in size. 
On July 4. the plants collected were very refractory, drying 
and curling up to such an extent that no really satisfactory sections 
could be obtained. Antherozoids were still unshed and archegonia 
seemed to be mature but no signs of a fertilized egg cell could be dis- 
covered. 
On July 10 the material collected furnished much of interest and 
a great variety of stages from the one-celled stage of the archegonium 
to the young embryo, figs. 30a and 31a. One section resembled 
fig. 27a collected June 10. Another showed that fertilization had 
already taken place, the egg cell having divided to form a severai- 
celled embryo. A corresponding growth had taken place in the 
walls of the venter. This new growth had proceeded far enough so 
that the young embryo under the well developed involucre (which 
was still lifted up) was visible to the naked eye. 
Sections through material gathered July 18, fig. 32 showed the 
embryos to be much larger, having by this time developed into a many 
celled, somewhat-pear shaped body. On some plants the involucres 
were wide open, on others tightly closed. These plants were taken 
from soil that was saturated with water. As was to be expected from 
former observations, the plants were of large size and the few that were 
fruiting were advanced in development. But so large a proportion of 
the plants were sterile that it was difficult to find enough good ma- 
terial for the fixing solution. 
The plants collected on July 26 again showed great diversity of 
development, some being very immature with unfertilized archegonia, 
others being sterile, others of an early stage after fertilization (fig. 
34), others showing more advanced stages after fertilization (Fig. 33), 
The most advanced stage found among these sections is represented 
in Fig. 35. Here the embryo shows some advance over that gath- 
ered July 18, for it is larger in every way, and the walls of the venter 
have increased considerably. A protracted period of dry weather 
possibly had checked the growth of the plants. 
Of the eleven collections made in August only three showed any 
marked development. Plants collected August 2 showed exactly the 
same stages as are illustrated in fig. 35. At this season the rhizoids 
have become so thick and the plants are so closely attached to the 
soil that more time and patience than ever is needed to clean them 
