NOTES AND QUERIES. 107 
Soon after the publication of the formula for the biniodide of mer- 
cury solution previously referred to, I mounted a slide of Amphipleura 
in it, using a tin-foil cell. The next evening I took it out to exhibit 
to a friend, but was amazed to find the cell empty. A little inves- 
tigation revealed the fact that the mercury in the solution had 
formed an amalgam with the tin-foil, completely destroying the cell. 
It was rather a mortifying blunder, that even a tyro in chemistry 
would scarcely have made. Shellac, rubber cement, Brunswick 
black, marine glue, gold size, etc., all have their appropriate uses, 
and the microscopist’s best judgment should be exercised in making 
a selection. For use with an oily medium, the writer has found 
stratena to be well adapted, as it is not acted upon by oils. It 
works very smoothly, too, with a brush, but, as it is affected by 
water—and hence by the moistening of a slide, which often occurs 
—it should be covered with some other cement for a permanent 
finish. : 
As a transparent finish for ringing slides, I know of nothing 
better than either Brown’s rubber cement or Queen’s colourless 
marine glue, both of which work easily and dry rapidly. The latter 
will probably prove of much value as a cement in consequence of 
its insolubility in most mediums. My attention was called to this 
in trying to clean brushes with which it had been used. Alcohol 
and even benzole were ineffectual, fusel oil being the only true 
solvent.—Zhe Microscopical Bulletin. 
NOTES AND QUERIES. 
AS we wish to relieve ourselves of all purely 
business transactions in connection with the Journal, 
subscribers are kindly requested to pay the amount 
of their subscriptions to Messrs. Tubbs, Brook, and 
Chrystal, 11, Market-street, Manchester. 
ALL matter intended for publication must be sent before the 12th | 
of each month to the Editor, Mr. George E. Davis, The 
Willows, Fallowfield, Manchester. 
DEATH oF Mr. CuarLes StoppER.—To Mr. Charles H. Bassett 
we are indebted for information in regard to the death of Mr. 
Stodder. The Boston Zvanscript of January 15th contained the 
following notice :— 
“Mr. Charles Stodder, well known in this city, and formerly 
_ connected with the trade in optical instruments, died on Sunday 
at the age of seventy-seven. He was at one time in business in 
