240 THE MICROSCOPE. 
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 ects. each. Slides and for- 
mul of new stains etc., 75 cts. each. A large vary of poly 5 cts. a package.. 
J.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. 
SLIDES, labels for same and material in exchange for slides. 
EUGENE PICKNEY, Dixon, Ill. 
ANTED—Microscope of modern make, Bausch & Lomb Investigator preferred. Also 
Forciminifera Polyeistina. Will give fine slides or cash ; 
E. H. RICHARDS, Woburn, Mass. 
WANTED—Good Zentmeyer Microscope Stand, Binocular preferred, none but a first 
class instrument. M. DE BALD, 136 Goodell St., Buffalo, N. Y. 
FoR EXCHANGE.—Living specimens of Volvox Globator by mail for other “raw ma- 
terial’? or mounted slides. Also one of Queen’s dollar sets of untreated diatoms. 
Polycystines especially desired : 
ROBT. W. WOOD, JR, Revere St., Jamaica Plain, Mass. 
FoR EXCHANGE.—Mounted sections.of injected lung of guinea pig. 
CHAS. BLASDALE, Jericho, Queens Co., N. Y. 
OR EXCHANGE—Mound builders relics, pottery fragments and Indian relies for 
medical books and surgical instruments. DR. HENRY W. COE, Mandan, Dakota. 
FRESH WATER ALG, very numerous species, including Volvox in abundance, Des- 
mids, of all kinds, Draparnaldia, Rivalaria, Anabaena Tetraspora &c., &e. 
J. M. ADAMS, Watertown, N. Y. 
DIATOMACEOUS Earth from Denver, Col.. in exchange for mounting material. 
H. B. CHAMBERLIN, box 1597, Denver, Col. 
I HAVE for exchange Stellate Hairs of Plants, Pollen, and Seeds ; also various Diatoms, 
Polycistina, etc., anda variety of other good objects, all well mounted. 
W. FARNELL, Macon, Ga. 
FOR 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. 
A CARIINSECTS, pathological and other well mounted slides, in exchange for Pleuro- 
sigma, Trichina, Diatoms, Stained Bacteria, ete. J. O. Stillson, Indianapolis, Ind. 
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, Geneva, N. Y 
T)IATOMACEOUS Clay from this place and slides of Foraminifera and Diatoms to ex- 
change for fine slides or material. E. H. RICHARDS, Woburn, Mass. 
ANTED.—Unmounted material of any kind ; foraminifera and diatoms preferred ; 
will give good exchange. M. A. BOOTH, Longmeadow, Mass. 
FoR EXCHANGE—Catheart’s ether freezing microtome, complete. Would prefer an in- 
jecting syringe. A. B. AUBERT, Orono, Penobscot Co., Maine. 
WANTED—No. 5 of Vol 2,and No. 1 of Vol. 3. This journal. Who can supply ? 
D. HUMPHREY, Lawrence, Mass. 
For EXCHANGE—A new mechanical finger for a copy of Beale or Carpenter ; slide of 
grouped diatoms for French objective, 44 inch in focus. . 
HAROLD POLWE, 136 High St., Peoria, Il. 
WANTED—Complete or partial set of Woodward’s photo-micrographs ; also to ex- 
change, photo-micrographs of various objects ; alist of which will be sent on ap- 
plication JAS. B. SHEARER, Cor. Center & Adams Sts , Bay City, Mich. 
WANTED—Gross’, Erichsen’s, or Bryant’s Surgery, last_edition, in exchange for a 1 in 
Spencer objective, turn-table, Walmsley pattern, or Microscopical books. 
Address, Box 213, Fayetteville, N. Y. 
