162 THE NORTHERN MICROSCOPIST. 

forms, and thus shewed how each lens was adapted to its place and the work it 
had to perform. He then explained the working of concave reflectors and 
their application in various forms to the microscope. 
The only new pond life form of any importance found during the past month 
is the Crown Animalcule Stephanoceros Eichhornit. 


NOES AND. QUERLES. 
Mountinc VoL_vox GLopaTor.—In the last number of Zhe 
Northern Microscopist there is a communication, remounting 
volvox, in which the expression, ‘boiling, &c., in the usual way,” 
occurs. Does the writer mean that he boils the volvox before 
mixing with the jelly? Further particulars of the method 
employed will, I am sure, be desired by many. In my own case, 
slides mounted in 1878 are as good to-day as when fresh, with 
the exception of a very slight loss of colour, which was not 
noticeable at first. These, both V. Globator and V. stellatus, were 
mounted while alive in glycerine jelly as cool as possible. Volvox 
mounted in Canada Balsam have not changed colour at all. 
—TI. R. B. 
EGGS OF PARASITE OF Roox.—Walking a few days ago near 
the rookery of Fallowfield Brow, as the place is called, I was 
impressed with the angry chatter of the birds, and the large num- 
ber of black feathers scattered on the ground. It occurred to me 
that the eggs of the rook parasite might be upon the feathers. I 
collected a number of them, and on my return home examined 
them under the microscope, when I found that my conjecture was 
correct, for hundreds of the eggs were crowded in a mass upon the 
stalk of one feather only. Other feathers had but a comparative 
few upon them. As I examined the eggs I noticed several young 
parasites escaping from the fractured shells, prepared to begin 
public life on their own account. THoMAS BRITTAIN, 
MountTinG INSEcTs, &c., WHOLE WITHOUT PRESSURE.—Will 
some microscopist kindly give me information as to preparing and 
mounting insects, larva, &c., whole and without pressure. Also 
the medium used. The same as Enock’s mounts.—&. C. &. 
A WarNING TO COLLECTORS.—At Skipton, on Saturday, April 
19, a young man from London was charged with taking two ferns 
from Gill Beck, Bolton Woods. Mr. Heelis prosecuted on behalf 
of the Duke of Devonshire. Police-constable Renton said he had 
cautioned the defendant many times. The bench fined the 
defendant 5s. and costs. ; 
