I12 THE MICROSCOPICAL NEWS, 
glacial acetic acid, and } collodion in 40 parts. The whole is then 
laid on by the help of 8c.c. or 20c.c. of a mixture of one part 
acetic acid, and three parts absolute alcohol. To prepare plates 
with this emulsion they must first be covered with a solution of 
caoutchouc. The development is made with pyrogallic acid. The 
Vogel Emulsion may be obtained from M. Scheeffner, 10-12, 
Passage du Buisson-Saint-Louis.—/. de Fhot. et de Mic. 
“THE NATURALISTS’ WoRLD” is a monthly magazine which 
commenced its existence in January of the present year. Its cost 
is twopence, and its aim seems to be that of popularising the 
study of scientific subjects. We wish the magazine every success, 
but fear the first number has not proved sufficiently attractive, nor 
does it set forth in the most satisfactory manner the idea of the 
intended practical nature of the work. The Publishers are Swan 
Sonnenschein & Co., of London. 
PROCEEDINGS OF THE AMERICAN SOCIETY OF MICROSCOPISTS. 
—We have received this very interesting brochure of 270 pages, 
and offer our best thanks to the donors of the same. We con- 
gratulate the members of this Society upon the very excellent 
manner in which the sixth Annual Meeting was managed at 
Chicago, and we think that the details of this meeting as published 
in pages 248-268 may be studied with profit by every member of 
our Microscopical Societies at home. We shall endeavour during 
the year to reproduce some of the papers read at the Chicago 
meeting. 
Pror. ABBE’S PAPERS.—We have been asked by several of our 
subscribers to reproduce a// these papers which have from time to 
time appeared on the microscope. Believing this to be one method 
of propagating a true knowledge of microscopy, we shall endeavour 
to devote as much space to the purpose as we can well afford. 
“EVENINGS WITH THE Microscope.”—Next month we hope 
to be able to commence a series of papers under the above head- 
ing, especially intended for beginners, and written in a popular 
style ; perhaps the Honorary Secretaries of Microscopical Societies 
will call the attention of their junior members to this. 
LEITZ OIL IMMERSION OBJECTIVES.—Owing to want of space 
this month, we are compelled to postpone an account of these 
lenses to our next issue. Some remarks upon oil immersion lenses 
generally may be found in the article “Infusoria from a water- 
butt ” in the present number. 
EARLY OBJECTIVES.—We have been promised the loan of 
several of the earlier objectives, which were used over the markings 
of diatoms, on their first discovery. The comparison of these 
glasses with those of the present day will be interesting. 
