32 The Microscope. 



EXCHANGES. 



This department is for the benefit of subscribers who have microscopical apparatus, 

 material or books which they wish to exchange, and xucli wants will be given one insertion 

 FREE OF CHARGE. Dealers are referred to our advert ishig deparlment. 



POLLEN and Vegetable slides double stained (new method) 5() cts. each. Slides and for- 

 mulae of new stains, etc. , 75 cts. each. A large variety of pollen, 5 cts. a package. 



J. D. BEUK, Liberty, Tioga Co., Pa. 



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ANTED — A Milliampermeter in exchange for cabinets, slides or cash. 



CHAS. BLASDALE, M. D.. Jericho, Queen's Co., N. Y. 



SLIDES, labels for same and material in exchange for slides. 

 EUGENE PICKNEY, Dixon, 111. 



WANTED— Microscope of modem make, Bausch & Lomb Investigator preferred. Also 

 Foraminifera Polycystina. Will give fine slides or cash. Diatomaceous clay from 

 this place and slides of Foraminifera and Diatoms toexchaners for fine slides or materiaL 



E. H. RICHARDS, Wobum, Mass. 



WANTED— Good Zentmeyer Microscope Stand, Binocular preferred, none but a first- 

 class instrument. M. DE BALD, 136 Goodall St., Buffalo, N. Y. 



FOR EXCHANGE)— Living specimens of Volvox Globafor by mail for other "raw 

 material" or mounted slides. Also one of Queen's dollar sets of untreiled diatoms 

 Polycystines especially desired. ROBT. W. WOOD. Jr., Revere St., Jamaica Plain, Mass. 



Tj^OR EXCHANGE— Mounted sections of jnjected lung of guinea pig^ 



CHAS. BLASDALE, Jericho. Que-ns Co., N. Y. 



FOR EXCHANGE- Mound builders relics, pottery fragments and In^ ^an relics for medi- 

 cal books and surgical instruments. "DR. HENRY W. COE, Jlandan, Dakota. 



FRESH WATER ALG^, very numerous species, including Volvox in abundance, Des- 

 midsof all kinds, Drapamaldia, Rivalaria, Anabaena Tetraspora. etc., etc. 



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., and a variety of other good objects, all well mounted. 



W. FARNELL, Macon. Ga. 



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 Pleuro- 

 sigma. Trichina, Diatoms, Stained Bacteria, etc. J. O. STILLSON, Indianapohs, 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. 



WANTED— Unmounted material of any kind; foraminifera and diatoms preferred; will 

 give good exchange. M. A. BOOTH, Longmeadow, Mass. 



■OOR EXCHANGE— Cathcart's ether freezing P}icrotome, complete. Would prefer an 



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injecting syringe. A. B. AUBERT, Orono, Penobscot Co., Maine. 



ANTED -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, M inch in focus. 



HAROLD POLWE, 136 High St., Peoria, HI. 



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ANTED — Complete or partial set of Woodward's photo-micrographs; also to exchange 

 photo-micrographs of various objects: a list of which will be sent on application. 

 JAS. B. SHEARER, Cor. Center & Adams Sts., Bay City, Mich. 



SELENITE FILMS, neatly mounted and giving a beautiful chromatic display, for use 

 with the polariscope, 25 cts. R. W. WOOD, Jr.j Jamaica Plains, Mass. 



I WILL exchange algae, dlatomaceous earth, diatoms in situ on algae (mounted or 

 unmounted) and a variety of miscellaneous .slides, for well mounted slides, diatoms and 

 histological slides preferred. F. L. CANCH, Carpenteria, Santa Barbara Co., Cal. 



