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FROM A MICROSCOPIST S NOTE BOOK. 
W. LAWRENCE SCHROEDER. 
Early in March there was a remarkable ‘ florescence ’ of 
V orticellae in two of my jars. By the end of the month — about 
March 26th — the Vallisneria, Myriophyllum, Elodea, and the 
filamentous algae, Spirogyra, Oedogonium, and others, were 
covered : it seemed as if all the plants in the jars were coated 
with fluff. The state of things lasted until about the middle 
of April, when the weed was in the main clear. 
On February 5th I made a vaseline life-slide on which 
was an encysted Vorticella. The denser inner part was 
surrounded with an almost transparent structure. There was 
very slight amoeboid movement. Two days later, the appear- 
ance had been modified, the movement was more marked, 
the inner denser part had put out a tongue -like process. On 
February 9th, the Vorticella was in full movement, and 
complete save for the ‘ stalk ’ but the beginning of that 
could be seen. 
I had an interesting experience once, in showing slides 
of microscopic life on the lantern screen. I had prepared a 
slide on which was a female Cyclops, with well-developed 
eggs in the two sacs attached to the lower end of the body. 
Two and a half hours later, when the slide was thrown on the 
screen, all the eggs save three had hatched. The young 
Cyclops were swimming about in a very lively manner. 
From a pond in the Shilden Valley I took, some years ago, 
on March 5th, a green Hydra, with eleven tentacles and a 
bud. Green Hydra have a way of disappearing into the 
debris at the bottom of the jar and then a few days later 
re-emerging in quantity. 
On July 19th, 1916, I took from one of the Bramhope 
ponds a number of colonies of Ophrydinum versatile — a 
ciliate protozoon, similar in form to Vorticella. The largest 
specimen was nearly two inches in diameter, the smallest 
about half-an-inch. 
Some duckweed — Lemna minor — got from one of the 
Bramhope ponds in early July, after being in the jar for 
just a month, presented an extraordinary appearance, the 
rootlets being covered with a species of Closterium. There 
were about fifty in one cluster, and over a hundred on the 
rest of the rootlets. There must have been several thousands 
in the entire group. 
From a little pool on the top of Fairfield, near Coniston 
Old Man, I took, some years ago, in late August, the colonial 
Dinobryon sertularia, one of the Chrysomonadales. 
There were eight in one colony, in another, at least 
twenty. Here and there were empty cases, in one of the 
1933 Sept. 1 
