248 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
V Microscopy at the Paris Exhibition. — The ‘ Annales de Micro- 
graphie ’ has concluded * * * § a series of brief articles on the Microscopes 
and apparatus at the Paris Exhibition of 1889, which, with those of Dr. 
Pelletan in the ‘Journal de Micrographie,’ and of Mr. Mayall in this 
Journal, constitute, so far as we know, the only record of this section of 
the Exhibition. 
Price of the new Objective of 1*63 N.A. — We understand that 
the price of this objective is not 10,000 francs or 400Z., but 1000 francs 
or 40Z. An extra nought seems to have crept into the original report 
on the subject. 
iS. Technique.! 
Cl) Collecting Objects, including Culture Processes. 
Friedlander’s Microscopical Technique for Clinical and Patho- 
logical Purposes.^ — Dr. C. J. Eberth has just published the fourth 
edition of C. Friedlandor’s well-known work on microscopical technique. 
The author has not only revised the whole, but made considerable 
improvements. For example, Section II., which treats of the microtome, is 
much enlarged, and Section III., dealing with the methods of preparation, 
such as hardening, imbedding, &c., has evidently had a good deal of 
pains bestowed on it. Some of the sections, e. g. Section V., “ Observing 
Living Tissues,” are unaltered, and some sections appear to contain views 
of doubtful value, but on the whole the work is one which can be 
recommended to the bacteriologist and the pathological anatomist. 
Artificial Cultivation of Ringworm Fungus.§ — Dr. H. L. Roberts’ 
observations, and his conclusions from a series of cultivation experiments 
made on Trichophyton tonsurans, are very interesting. A portion of 
scalp affected with ringworm was first cleansed with a 1 : 200 solution 
of corrosive sublimate. The broken hairs were then removed with 
forceps, and their bulbous ends having been snipped off, the pieces were 
dropped into flasks containing saccharine infusion of malt and alkalinized 
beef-broth, and incubated at 30° C. 
The fungus was observed to have started developing in 24 hours, 
and in three or four days from the formation of the primary colony 
secondary deposits were visible. If the colonies rose to the surface, 
they speedily became covered with a white powder. On microscopical 
examination the mycelium was found to be regularly septate, and filled 
with a granular protoplasm. When development takes place in air, the 
mycelium becomes finer, the segments are small, and the terminal fruit- 
beaiing filament may end in an ampulla. The spores are pear-shaped, 
are attached by their narrow end, and are sometimes seen to project from 
the ampullae. 
Inoculation experiments on guinea-pigs, and on the author’s own 
* Ann. de Micrographie, ii. (1890) pp. 168-71. 
t This subdivision contains (1) Collecting Objects, including Culture Pro- 
cesses; (2) Preparing Objects; (8) Cutting, including Imbedding and Microtomes ; 
(4) Staining and Injecting; (5) Mounting, including slides, preservative fluids, &c. ; 
(6) Miscellaneous. 
J ‘ Friedlander’s Microscopical Technique,’ 4th edition revised by C. J. Eberth, 
Berlin, 1889. Cf. Centralbl. f. Bakteriol. u. Parasitenk., vii. (1890) p. 72. 
§ ‘ British Journal of Dermatology,’ i. (1889) pp. 859-65 (3 pis.). 
