24 THE MICROSCOPE. 
EXCHANGES. 
(Exchanges are inserted on this page without charge. Subscribers having 
microscopic apparatus for sale or exchange can announce the same without 
charge.) 
IATOMS ON ALGA. Achnanthes bevipes, etc., Polycistana, Fossil 
Diatoms, etc., Sertularia Pluma, Sertularia Crustata, etc. Spore cases of 
Fern too numerous to mention, to exchange for well mounted objects. WM. 
FARNELL, Macon, Ga. 
OR SALE.—Ross Binocular Microscope, 6 objectives and full accessories, 
cost originally, $650. Address, J. G. Langguth, 135 Wabash Ave., Chicago. 
Also a large *‘Beck Binocular, $600 outfit,”’ cheap. ° 
HAVE quite a collection of histological mounts which I should like to ex- 
change for other good slides) E. M. WATERBURY, M. D., Saratoga. 
Springs, N. Y. 
XCHANGE.—I have a large number of vegetable mounts, single and 
double staining. Would like to exchange for any specimens of interest. 
MISS L. M. BERKEY, Grand Rapids, Mich. ' 
HOMOGENEOUS immersion (works also dry, water or glycerin) I-15, 
180° adjustable, to exchange for a higher power. A. Y. MOORE, 57 
Prospect st., Cleveland, Ohio. 
OR SALE OR EXCHANGE for objectives or accessories, one copy Car- 
penter’s ‘‘The Microscope and its Revelations,’ also Dana’s ‘‘Manual 
of Geology.” Both books are new and latest editions. Cost $10.50. H. F. 
WEGENER, Denver, Colorado. ; 
A. RICHARDS, of St. Louis, Mich., has for exchange a few mounts 
. of double-stained and single-stained vegetables; also a number of well- 
mounted injected specimens. 
ILL EXCHANGE a June or December, 1881, number of this journal for 
a February number, 1881, or will pay cash for same. D. M. COOL, 
Faribault, Minn. 
LEASE ANNOUNCE that I will supply labels, cards, and other first-class 
printing in exchange for good slides. EUGENE PINCKNEY, Dixon, Ill. 
XCHANGE.—Untreated diatoms and miscellaneous material in large 
4 variety to exchange for good prepared material for mounting of any kind. 
M. A. BOOTH, Longmeadow, Mass. 
OR SALE.—One Tolles’ 4-10 objective of 100° adjustable; also one 1% 
inch objective of 23° by William Wales. Both made to order and first- 
class. A. L. WOODWARD, Syracuse, New York. 
We INSECTS, Spermatozoa of Horse, Pathological and other well 
mounted slides in exchange for Pleurosigma, Trichina, Diatoms, Stained 
Bacteria, &c., &c. J. O. STILLSON, 504 Upper 2d St., Evansville, Indiana, 
ip oa a large number of histological mounts for exchange. T. B. 
STOWELL, Ph. D., Cortland, N. Y. 
peli Cae UD a NE re 
WILL exchange good, histological for other first class mounts. S. G. 
SHANKS, M. D., 547 Clinton Avenue, Albany, N. Y. 
