B22 ON NAIAS GRAMINEA DEL., VAR. DELILE! MAGNUS. 
free pollen, my home observations leave me no doubt that pollen is 
carried to the pistilliferous flowers by the current ; in such case the 
plant would be hydrophilous. While, however, examining portions 
living plant on which were ripe anthers, I noticed a colony of 
Vorticellide attached to one of the fascicles of leaves; the grace 
and activity of its movements led me to watch it for a considerable 
by its marginal cilia. The alternate contraction and elongation of 
the elastic and thread-like pedicles of the colony kept the pollen- 
grains im constant motion, which left me no doubt that at times the 
grains would be directly borne to the stigmatoid appendages of the 
pistilliferous flowers. 
to find distinctive protozophilous plants, dependent for their ferti- 
lisation upon animal life in the aqueous world, in much the same 
way as we find entomophilous plants in the aérial world. 
t is a very happy circumstance that Sir Joseph Hooker should 
have indicated the forms of pollination which prevail in many 
known. Sprengel, Darwin, Muller, 
XIV.—Tuse Fruit. 
to the time of the fer- 
and becomes a mature fruit, 
covered with a testa formed 3 
thick-walled cells (figs. 810 
838). a 
