192 Tue MIcRoscops. 
EXCHANGES. 
(Exchanges are inserted without charge. Subscribers having microscope apparatus for sale or 
exchange can announce the same without charge.) 
POLLEN and Vegetable slides double stained (new method) 50 cts. each. Slides and formulz of 
new stains etc., 75 cts. each. A large variety of pele 5 cts. a package 
ge. 
D. BECK, Liberty, (Tioga Co.) Pa. 
WANTED-A Milliampermeter in exchange for cabinets, slides or cash. 
CHAS. BLASDALE, M. D., Jericho, Queens Co., N. Y. 
W ANTED~ Saville Kent’s ‘*‘ Manual of Infusoria,’’ bound or unbound, text with plates. Ad- 
dress with lowest cash price E. 8. COUTANT, Des Moines, Ia. 
W ANTED~—Microscope of modern make, Bausch & Lomb Investigator preferred. Also For- 
ciminifera aud Polycistina. Will give fine slides or cash. E. H. RICHARDS, Woburn, Mass. 
W ANTED-— Good Zentmayer Microscope Stand, Binocular preferred, none but a first class in- 
strument. M. DE BALD, 136 Goodell St. Buffalo, N. Y. 
Por EXCHANGE.—Living specimens of Volvox Globator by mail for other ‘raw material” or 
mounted slides. Also one of Queen's dollar sets of untreated diatoms. Polycystines especially 
esired. ROBT. W. WOOD, JrR., Revere St., Jamaica Plain, Mass. 
FoR EXCHANGE.—Mounted sections of injected lung of guinea pig. 
CHAS. BLASDALE Jericho, Queens Co., N. Y. 
FoR EXCHANGE—Mound builders relics, pottery ee and Indian relics for medical books 
and surgical instruments. DR. HENRY W. COE, Mandan, Dakota. 
FRESH WATER ALG A, very numerous species, inclnding Volvox in abundance, Desmids of 
all kinds, Draparnaldia, Rivalaria, Anabaena Tetraspora &c., &c. 
= J. M, ADAMS, Watertown, N. Y. 
DIATOMACEOUS Earth from Denver, Colo., in exchange for mounting material. 
H. B. CHAMBERLIN, box 1597, Denver, Colo. 
I HAVE for exchange Stellate Hairs of Plants, Pollen, and Seeds; also various Diatoms, Polycis- 
tina, etc., and a variety of other good objects, all well mounted. W. FARNELL, Macon, Ga. 
OR SALE.—A copy of Prof. Leidy’s great work on the Rhizopods has been left at this office for 
sale. Price, $7.50. Cc. H. STOWELL. 
I WILL exchange good histological for other first-class mounts. 
S. G. SHANKS, M.D., 547 Clinton Avenue, Albany, N.Y. 
ACARI INSECTS, pathological and other well mounted slides, in exchange for Pleurosigma, 
Trichina, Diatoms, Stained Bacteria, etc. J. O. STILLSON, Indianapolis, Indiana. 
AMPHIPLEURA PELLUCIDA, or any other test diatom, mounted in the new medium, having 
refractive index of 2.4, can be procured from H. H. CHASE, M.D., Geneva, N.Y. 
DIATOMACEOUS Clay from this place and slides of Foraminifera and Diatoms to exchange for 
fine slides or material. E. H. RICHARDS, Woburn, Mass. 
ATHOLOGICAL, Histological and Miscellaneous Mounts, will be exchanged for mounted speci- 
mens or material. H. W, WESTOVER, M. D., St. Joseph, Mo. 
ANTED.—Unmounted material, any kind; foram-inifera and diatoms preferred ; will give 
good exchange. M. A. BOOTH, Longmeadow, Mass. 
FOR EXCHANGE—Cathcart’s ether freezing microtome, complese. Would prefer an injecting 
syringe. A. B. AUBERT, Orono, Penobscot Co., Maine. 
WANTED-No. 5 of Vol. 2, and No. 1of Vol. 3. This journal. Who can euppne 
D. HUMPHREY, Lawrence, Mass. 
FOR EXCHANGE—A new mechanical finger for a copy of Beale or Carpenter; slide of grouped 
diatoms for French objective, 14 in. focus. HAROLD PLOWE, 136 High St., Peoria, Ill. 
FOR EXCHANGE OR SALE--Wood sections, mounted or unmounted. Also few mounts of 
water-washed diatoms. H. M. RICHARDS, Sadsburyville, Pa. 
ANTED—Micro-dictionary, 1 in. objective, accessories, rare diatoms, etc., for rare and ordi- 
nary slides. Please exchange lists. R. E. WOOD, St. Helena, Napa Co., Cal. 
