SEAWEEDS AND PONDWEEDS ap 
travelling protoplasm. The mother-cell, on the other 
hand, which is close by upon the same branch, contains 
the “eggs,” enclosed by five spiral tubes, which run 
over the top of the nest, as one may call it, and form 
a cap. After a time the orange-coloured father breaks 
up, and the morsels of travelling protoplasm escape 
from the hair-cells. They travel about in the water 
until they find a mother-cell. They force their way 
down between the twisted tubes and fertilise the waiting 
plant eggs. 
In the next chapter we shall see how there are 
parallel groups to these three amongst the funguses, and 
from them we shall go to the mosses and the ferns. 
