EXCHANGES. 



(Exchanges are inserted without charge. Subscribers having microscope apparatus for sale or 

 exchange can announce the same icithout charge.) 



FOR EXCHANGE— Mammoth Atlas of Human Anatomy, 45 parts, unbound, by Drs. Vesterrei- 

 Klier and Erdl. Cost me *33.75. Will exchange for «20 worth of accessories or objectives. 



DR. C. H. LOVEWELL, Englewood, 111. 



DIATOMACEOUS Earth from Denver, Colo., In exchange for mounting material. 

 H. B. CHAMBERLIN, box 1597, Denver, Colo. 



WANTED to exchange a Seller's section knife carrier (newt for a good microtome or turn-table. 

 J. T. WAlD, M. D., Rldgway, Pa. 



WANTED— Microscope stand and microscopical books and journals. Will give various articles 

 or cash for same. Send for list. C. VON E1FF, Jr. 347 Greenwich St., New York City. 



WOULD like to exchange a 1-6 in. object, drv, 160° for a first-class microtome. 

 J. B. JENNINGS, 78 Mayor block, Chicago, 111. 



WANTED.— One second-hand turn table ; also one second-hand section cutter for soft material ; 

 also one second-hand micro-dictionary. Above must be very low priced and in fair order. 

 Send description of style and cost to E. S. COUTANT, 1022 Woodland ave., Des Moines, Iowa. 



WILL EXCHANGE OBJECTIVE.— An adjustable Nachet 1-9 (dry) -society screw, with very 

 long working distance— has moderate angle. Correspondence solicited. 



a E. T. BKCKWITH, M. D., Urbana, Ohio. 



TO EXCHANGE— Pulvermacher chain battery (100 elements) for applying electricity to the body 

 —cost *30 for cheap microscope stand, slides, minerals or lantern slides. 



J. CROWTHER, 320 Pleasant St., Fall River, Mass. 



FOR EXCHANGE— A good refracting telescope 2J_ in. operture which will resolve Epsilon Lyra 

 with half inch eye piece— value $65, will exchange for a first-class Bausch & Lomb objective. 



J. E, WHITNEY, Rochester, N. Y. 



WANTED.— Diatoms on Algue 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. Kappahanock Cliff, Piscataway. New and old Nottingham, Maryland. Will give 

 cash or beautiful diatom material from Europe in exchange. 



J. C. R1NNBOCK, WIen, Simmering 14, Austria. 



WILL exchange mounted slides of various minerals (native crystals), and others, for well 

 mounted slides. WILL H. OLMSTED, Syracuse, N. Y. 



EXCHANGE.— Parties having dlatomaceous earths or other microscopical material, prepared or 

 crude, for exch ange, please communicate with M. A. BOOTH, Long meadow. Msss. 



QUEEN'S New Sub-Stage Condenser, with dividing combination for high or low powers, and 

 thr ee Caps, for sale or exchang e. DR. A. C. STOKES, Trenton, N. J. 



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. 



HISTOLOGICAL and Pathological Slides to exchange for other good slides. 

 F. F. COL WELL. Urbana, Ohio. 



FRESH-WATER ALGJE, nearly all genera, and many beautiful varieties; also Euglena, Astasia, 

 etc.. for good pathological or other interesting slides. Lists exchanged. 



J. M. ADAMS. Watertown, N. Y. 



FOR SALE.— A copy of Prof. Leidy's great work on the Rhizopods has been left at this office for 

 sale. Pr ice, 87.50. C. H. STOWELL. 



I WILL exchange good histological for other first-class mounts. 

 S. G. SHANKS, M.D., 547 Clinton Avenue, Albany, N.Y. 



HISTOLOGICAL SLIDES, very thin and evenly cut, well mounted and well ringed, will be ex- 

 changed for Pathological or Histological slides only 



H. L. WHITNEY, M.D., German Hospital, Philadelphia. Pa. 



PLEASE announce that I will supply labels, cards, and other first-class printing in exchange for 

 good slides. EUGENE PINCKNEY, Dixon, 111. 



ACARI INSECTS, pathological and other well mounted slides, in exchange for Pleurosigma, 

 Trichina, Diatoms, Stained Bacteria, etc. J. O. S ITLLSON, Indianapolis, Indiana. 



FOR SALE —Slides, double stained, of Bacillus Tuberculosis, 50c. each. 

 DR. W. R. C H1TTICK, 83 Lafayette Avenue, Detroit, Mich. 



WANTED.— Books treating on microscopical and histological subjects not already in my posses- 

 sion. Will pay cash, or give slides in exchange. State name of the work, date of issue, and 

 price. O. H. STOWELL, Ann Arbor, Mich. 



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. 



I WILL SEND a quantity of good dlatomaceous material containing Bacillaria Paradoxa— all liv- 

 ing—in exchange for well mounted slides. J AS. C. LATHROP, Bridgeport, Conn. 



PATHOLOGICAL, Histological, and other well mounted slides will be exchanged for mounted 

 specimens of, interest. Lists furnished on application. 



D. E. HAAG, M.D,, Liberty Center, Henry County, Ohio. 



