242 Scientific Intelligence. 
A frequent position is the under side of floating leaves, such as 
those of the Pond-lily, Nymphwea odorata; the Spaltceis 
Nuphar advena ; and the Nelumbo, Nelumbium luteum. Cer 
tain kinds of Rhizopods, especially the Heliozoa, or Sun-animal 
cules, are most frequent among floating plants, such as pines 
emna ; Hornwort, Ceratophyllum ; ~Bladde trwort, Utricularia ; 
and the various Confervas, as Zygnema, Spirogyra, Occillatedis 
and the Water-purse, Hydrodictyon. 
“In no other position have I found Rhizopods of the kind pe 
consideration in such profusion, number, and beau 3 of form as i 
sphagnous bogs, living in the moist or wet Bog-moss, or Sphagnum. 
Sometimes I have found this particular moss acindlly to swarm 
soe multitudes of these creatures of the most extraordinary kinds 
in the most highly developed condition. A drop of water 
acibaass from a little pinch of Bog-moss has often yielded scores 
of half a dozen genera and a greater number of species. Fre 
quently, however, the Sphagnum of many localities contains com- 
paratively few Rhizopods, though I have rarely found them 
entirely absent from this moss. Other mosses and liverworts I 
have not observed to be specially favorite habitations of - 
Rhizopods, not even such aquatic kinds as the Fontinalis. 
In water squeezed into a watch crystal soo a inal sag of 
Sphagnum Dr, Leidy obtained thirty-e' ght species. 
“The mode I have habitually adopted for collecting Rhizopods, 
which is also equally well adapted for collecting many © other 
microscopic organisms, plants, and animals, is as follows : 
n og ditches, or other waters, I use a small tin ladle, or 
the water and transferred t a glass jar. A small hole in the 
bottom of the ladle favors chee retention of the collected material, 
but care should be taken that it is not so large as to permit the 
material to stream through. After the Aleotagdee is full, ° 
poe 
from the ooze near the shores of lake and ponds than I have in 
deeper water; but this I suspect was alals due os the circum- 
stance that nea ar the shore I could see the ooze at the bottom of 
the — and could much better manage to collect the desired 
mate 
“ Aquatic plants, if rooted in — — should be carefully cut ee 
and gently lifted from the wate ‘as to disturb as little 
possible the adherent —— a a sufficient quantity we 
placed in a tinp or other vessel, water from other por 
tions of the plants may 5 se ene upon that which is retained. 
