72 THE Microscope. 
EXCHANGES. 
(Zuchanges are inserted without charge. Subscribers having microscope apparatus for sale or 
exchange can announce the same without charge.) 
OR EXCHANGE—Mound builders relics, pottery fragments and Indian relics for medical books 
and surgical instruments. DR. HENRY W. COE, Mandan, Dakota. 
OR 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 Eyepiece or collection of thin mounted Rock sections. 
' R. HENRY FROEALING, 17 South 12th street, Richmond, Va. , 
RESH WATER ALG, very numerous species, inclnding Volvox in abundance, Desmids of 
all kinds, Draparnaldia, Rivalaria, Anabaena Tetraspora &c., &c. 
: J. M, ADAMS, Watertown, N. Y. 
GEEDS 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 ne 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. 
W ANTED.—Diatoms on Algz 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. 
HAVE for exchange Stellate Hairs of Plants, Pollen, and Seeds; also various Diatoms, Polycis- 
tina, etc., anda variety of other goud objects, all well mounted. W. FARNELL, Macon, Ga. 
PUSTOLOGICAL and Pathological Slides to exchange for other good slides. 
F. F. COLWELL, Urbana, Ohio. 
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. 
AGARI INSECTS, pathological and other well mounted slides. in exchange for Pleurosigma, 
Trichina, Diatoms, Stained Bacteria, etc. J.O. STILLSON, Indianapolis, Indiana. 
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. 
-—— 
IATOMACEOUS Clay from this place and slides of Foraminifera and Diatoms to exchange for 
fine slides or material. E. H. RICHARDS, Woburn, Mass. 
England, Vol. I. andII. What offers ? GEORGE TIMMINS, Syracuse, N. Y. 
OR SALE.—Zentmay er’s 1-10 Ob. ective, practically new. Also Moller’s Diatom Plate No. 2. 
F j ; r é E. K. BAXTER, Sharon, Vt. 
W ANTED.—A copy of No. 1. Vol. IV., The Microscope ; will gtve slides in exchange, or cash. 
Very Truly, HENRY FROEHLING, Ricnmond, Va. 
ANTED.—Unmounted material, any kind; foram-inifera and diatoms preferred ; will give 
good exchange. M. A. BOOTH, Longmeadow, Mass. 
ANTED.—Good 1-4; 8 lass ; willexchange good objectives. including new Gundlach 4-10 
of 80°. we ae 1G OUDERDONK, Rugby, Tenn. 
Ww . ED.-- ks 0 Microsco 7 Will ive slides or cash for same. 
ANTED.---Books on PY S HAROLD PLOWE, Peoria, Il. 
Ww NTED.—Micrographic Dic’y, 4th ed. Will give Wales 1-10 immersion, 135°. 
APT ED gern “f e DR. ED. GRAY, Benecia, Cal, 
XCHANGE OR SALE.—Ether freezing microtome, pocket microscope lamp, 2in. objec- 
Sie Tolles. = FOLIA AUBERT, Orono, Maine. 
