Tae Microscope. 143 
& Quincy Railroad. Mr. Tammen offers it as a gift according to 
terms found in our advertising pages. 
AMERICAN METEOROLOGICAL JOURNAL: 
We have previously called attention to the prospectus of 
this journal. The May and June numbers are before us, and 
they are fully up to the high standard one would expect from 
such an editor as Professor Harrington. Single copies are 25 
cents. Address, W. H. Burr, Detroit, Mich. 
A letter has been received from the Rev. W. H. Dallinger, 
President of the Royal Microscopical Society, of London, 
stating that he intends to be present at the meeting of the 
American Society in Rochester. 
A summer course in botany will be given by Professor Tre- 
lease, of the University of Wisconsin, in the Botanical Labora- 
atory, corner of Garden and Linnean streets, Cambridge. from 
July 7th to August 16th. 
—__—_~<om_——__ 
ADDITIONAL EXCHANGES, CONTINUED FROM LAST 
PAGE. 
(This is a very interesting column to those engaged in practical work. Send 
on your notice and enter the list.) 
WILL send a quantity of good diatomaceous material containing Baccil- 
aria Paradoxa—all living—in exchange for well mounted slides. JAS. 
C. LATHROP, Bridgeport, Cor:n. 
IVING or mounted red astasia hematoides (Euglena viridis) also Valvox 
and other choice Algee in exchange for Algae, fungi or infusoria. J. 
M. ADAMS, Watertown, N. Y 
ILL Exchange mounted slides of various crystals, diatoms, in situ, stel- 
lete huirs of plants and micio fungi, for other good slides or material. 
JAMES EK. WHITNEY, Rochester, N. Y 
—— 
A'THOLOGICAL, Histological and other well mounted slides will be ex- 
changed for mounted specimens of iuterest. Lists furnished on applica- 
tion. D. E. HAAG, M. D., Liberty Center, Henry County, Ohio. 
\ K TOULD like to exchange a 1-6 objective, 160°, adjustable, for a lower 
power. A. Y. MOORE, 89 Prospect street, Cleveland, Ohio. 
