THe MIcroscore. 91 
The bacillus tuberculosis cannot establish itself in healthy lung 
tissue.” 
A New TEst FoR ORGANISMS IN WaAtTER.—Dr. Angus Smith’s 
test consists in rendering the water thick by dissolving gelatine 
init. If pure, the gelatine cylinder remained long unaltered ; 
but if the water is impure from the presence of organisms, the 
gelatine round the organisms becomes liquified and globular, 
the organisms remaining solid at the bottom of the spheres. 
Mountine Dratoms in Series.—P. Francotte has applied 
Giesbrecht’s method of mounting sections in series to the mount- 
ing of diatoms. The slide is coated with the solution of shellac 
in alcohol, washed over with oil of cloves or creosote, and the 
diatoms, previously placed in absolute alcohol, arranged in or- 
der. The slide is then warmed, and the oil of cloves or creosote 
evaporated. 
BI-CENTENARY OF Bacterta.—Cohn calls attention to the 
fact that, in a letter dated 14th September, 1683, A. van Leeu- 
wenhoek gave notice to the Royal Society that with the aid of 
his microscope he had discovered in the white substance adher- 
ing to his teeth very little animals, moving in a very lively 
fashion. ‘‘ They were the first bacteria the human eye ever 
saw.”—Vature. 
Baciiurt oF Tuspercite.—According to Prof. Rindfleisch, tu- 
bercular bacilli are best stained by fuchsin soluble in alcohol, 
but not in water. Two or three drops of a concentrated solu- 
tion in 2-3 cm. of anilin-oil water are sufficient. The staining 
is especially good at 40° C. The bacilli are uniformly stained 
if a few drops of fuchsin are added to a mixture of equal parts 
of alcohol, water, and nitric acid. 
Tue Eyres ConnectEep.—It has been shown by Knies and 
Horner, by injections of Prussian blue in dead bodies, that 
there is a direct communication between the two retinz by the 
way of the optic nerves and chiasma. Pfluger has corroborated 
these assertions by making injections in dogs with a few drops 
of a saturated solution of fluorescine. This fluid is forced into 
the optic nerve, so that it passes not only into the subar- 
achnoid but also into the subdural space. Two minutes after 
the injection both eyes showed a fluorescence of the retina, 
