48 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. 
| 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) 1-15, 
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. 
LEASE ANNOUNCE that I will supply labels, cards, and other first-class 
printing in exchange for good slides. EUGENE PINCKNEY, Dixon, IIl. 
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. 
CARI 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, 
AVE a large number of histological mounts for exchange. T. B. 
STOWELL, Ph. D., Cortland, N. Y. 
WILL exchange good, histological for other first class mounts. S. G. 
SHANKS, M. D., 547 Clinton Avenue, Albany, N. Y. 
OR EXCHANGE—A Tolles 1-15 inch immersion 104°—170° adjustable, 
to exchange for lower powers. J. B. MARVIN, 903 4th ave., Louis- 
ville, Ky. 
ANTED—Nos. 1 and 2, of volume 2, this journal, to complete set for 
binding. MARY F. HALL, Dayton, Ohio. 
