96 THE Microscopr. 
EXCHANGES. 
(Exchanges are inserted without charge. Subscribers having microscope apparatus for sale or 
exchange can announce the same without charge.) 
FoR EXCHANGE.—Living specimens of Volwox 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, 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 relics for medical books 
and surgical instruments. DR. HENRY W. COE, Mandan, Dakota. 
FoR EXCHANGE—One Fiddian Microscopic Illuminator, one Brass injecting Syringe with four 
pipes and stop cock, one Microtome (Brass) Rivet, improved, with knife, one Dr. Seilers Section 
Knife _and Carrier, one warm Stage with Thermometer and Gas Chamber in exchange for first 
class Polariscope with goniometer ee or collection of thin mounted Rock sections. 
DR. HENRY FROEHLING, 17 South 12th street, Richmond, Va. 
FRESH WATER ALG&, very numerous species, inclInding Volvox in abundance, Desmids of 
all kinds, Draparnaldia, Rivalaria, Anabaena Tetraspora &c., &c. 
J. M, ADAMS, Watertown, N. Y. 
SEEDS of Orthocarpus Purpurascens and slides of same in exchange for other objects mounted 
or unmounted. EDWARD GRAY, M.D., Benicia, California. 
W ANTED—Well cleaned and selected Foramenifera for which cash will be paid or slides given. 
EDWARD G. DAY, Riverside, Conn. 
DIATOMACEOUS Earth from Denver, Colo., in exchange for mounting material. 
"  H. B. CHAMBERLIN, box 1597, Denver, Colo. 
WANTED. —Diatoms on Algze or in muds from all the tropical sea shores, especially from 
Puget Sound, Pensacola, Campeach Bay, Tampa Bay, and fossil earths from Petersburg, 
Popleine, Virg Rappahanock Cliff, Piscataway. New and old Nottingham, Maryland. Will give 
cash or beautiful diatom material from Europe in exchange. 
J.C. RINNBOCK, Wien, Simmering 14, Austria. 
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. 
FOR SALE.—A copy of Prof. Leidy’s great work on the Rhizopods has been left at this office for 
sale. Price, $7.50. C. H. STOWELL. 
I WILL exchange good histological for other first-class mounts. 
S. G. SHANKS, M.D., 547 Clinton Avenue, Albany, N.Y. 
4s 
CARI INSECTS, pathological and other well mounted slides. in exchange for Pleurosigma, 
Trichina, Diatoms, Stained Bacteria, etc. J.O. STILLSON, Indianapolis, Indiana. 
A™MPHIPLEURA 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. 
—_—— 
DIAToM \CEOUS Clay from this place and slides of Foraminifera and Diatoms to exchange for 
fine slides or material. E. H. RICHARDS, Woburn, Mass. 
PATHOLOGICAL, Histological and Miscellaneous Mounts. will be exchanged for mounted speci- 
mens or material. H. W, WESTOVER, M. D., St. Joseph, Mo. 
W ANTED.—A copy of No. 1. Vol. IV., The Microscope ; will grve slides in exchange, or cash. 
Very Truly, HENRY FROEHLING, Richmond, Va. 
ANTED.—Unmounted material, any kind; foram-inifera and diatoms preferred ; will give 
good exchange. M. A. BOOTH, Longmeadow, Mass. 
ANTED.—Good 1-4; spy glass; will exchange good objectives. including new Gundlach 4-10 
of 80°. * C. OUDERDONK, Rugby, Tenn. 
W ANTED.—Mi r hic Dic’y, 4th ed. Willgive Wales 1-10 immersion. 135°. 
ae A al DR. ED. GRAY, Benecia, Cal, 
