672 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
35 per cent., and finally it may be immersed in water. Sections of 
optic nerve mounted on slides and carried into water must be treated 
for about half a minute with an aqueous solution of potassic hydrate 
(1/10 per cent.), then thoroughly washed in distilled water, and trans- 
ferred to Weigert’s hsematoxylin, in which they should remain for about 
three hours at 50° C. After distilled water and grades of alcohol they 
may be cleared in turpentine and mounted in benzol-balsam. Each 
nerve-fibre so treated has a distinct blue-grey outline. 
Methods of Recognizing Cysticerci of Taenia saginata.* — M. A. 
Laboulbene has a note on the means of recognizing the cysticerci of 
Taenia saginata , which are the cause of “ measles ” in veal and beef, 
and which are often so difficult to detect on account of the rapidity with 
which they dry on exposure to the air. He finds that meat which has 
become quite leathery will easily reveal the Cysticerci if it contain any, 
by being placed in water acidified with acetic or nitric acids, or in a 
mixture of water, glycerin, and acetic acid. By this means the parasites 
can always be detected, and if the meat be carefully heated to 50° or 
60° C. it is always fit for human food. 
Fig. 78. 
New Method for Examining microscopically the Elements and 
Tissues of Warm-blooded Animals at their physiological tempera- 
ture-t — This method, devised by M. L. Banvier, essentially consists in 
placing both the Micro- 
scope and the preparation 
to be examined in a bath 
of warm water (36° to 39° 
C.) But like most prac- 
tical things the details are 
more important than the 
principle. Thus the Micro- 
scope must be of a simple 
model. As the prepara- 
tion is to be examined 
under water an immersion 
objective with or without 
correction must be used. 
The preparation must be 
carefully protected from 
water by running paraffin 
round the cover-glass. 
Before using the objective 
it must be warmed up to 
40° C., otherwise a thick 
fog will spread over the 
face of the lens. The 
Microscope is placed in 
a flat-bottomed glass vessel 
about 0 • 12 m. high and 0 * 14 m. in diameter. This contains distilled water, 
heated up to 40°, in such quantity that its surface is from 0 • 5-1 cm. 
Comptes Rendus, cxi. (1890) pp. 155-7. f Op. c., cx. (1890) pp. 66-9 (1 fig.). 
