114 THE AMERICAN MONTHLY (Apr 
Quick METHODS OF STAINING THE GoNnococcus.—In the 
Zeitschrift fur Wissenschaftliche Mikroskopie, Unna gives 
the following quick method of staining gonococcus for di- 
agnostic purposes and immediate examination. Onaglass 
slip, let fall a drop of from a half to a 1 per cent alcoholic 
solution of anilin red, spread and dry quickly. A drop- 
let of the suspected matter is then put on the slip,on the 
spot where the red was applied, a cover-glass put on, and 
the slip transferred to the stage of the microscope and 
examined. The gonococci, if present, commence instant- 
ly to take up the coloring matter, and may thus be easi- 
ly discovered. 
LIMPID SOLUTION OF CopAL FoR MicroscopicaL UsE,— — 
The writer hereof has long used the following method of 
preparing gum copal for microscopical purposes. It furn- 
ishes an absolutely colorless and limpid preparation : Dis- 
solve 1 part of camphor in 12 parts of sulphuric ether, add 
3 parts of pulverized gum copal to the solution, Cork the 
flask tightly and set aside, with an occasional agitation 
until the copal is partly dissolved and partly swollen to 
its fullest extent. Now add # part of rectified oil of tur- 
pentine and 4 parts of alcohol 96 per cent, and agitate 
briskly. Set aside for a week or so, giving the flask daily 
occasional lively shakings. At length the copal will be 
found entirely dissolved, and the contents of the flask sep- 
arated into two layers, one of which, the lower, is dark, 
thick and possibly full of sedimentary matter, while the 
upper is limpid, clear as a crystal and rich in copal. Sy- 
phon off or decant the latter for use, and if too thin the 
solvent may easily be driven off. While the residual mat- 
ter in the flask still contains considerable copal, which 
may be extracted by repeating the operation, it will be 
found more economical to operate with a fresh charge of 
copal, when more is wanted.—WNat. Drug. 
STaIn FoR URINARY Deposits, —For staining the mor- 
