EXCHANGES. 



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

 exchange can announce the same iclthout charge. ) 



TfOR EXCHANGE— Mammoth Atlas of Human Anatomy, 45 parts, unbound, by Drs. Vesterrel- 

 J- gherand Erdl. Cost me §33. 75. Will exchange for 920 worth of accessories or objectlvi 



Uli. C. H. LOVEWELL, Englewood, 111. 



DIATOM ACEOTJS Earth from Denver, Colo., In exchange for mounting material. 

 H. B. CHAMBEKL1N, box 1697, Denver, Colo. 



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

 J. T. WAiD, M. D., Kldgway, Pa. 



WANTED— Microscope stand and microscopical boobs 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. JENNINGo, 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, 11)22 Woodland ave., Des Moines, Iowa. 



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

 lona working distance— has moderate angle. Correspondence solicited. 



E. T. BECKW1TH, M. D., Urbana, Ohio. 



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

 —cost $3U for cheap microscope stand, slides, minerals or lantern Blidi s. 



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



FOR EXCHANGE— A good refracting telescope 2}4 in- operture which win resolve Epsilon Lyra 

 with half inch eye piece— value SK>, will exchange for a first-class Bauscb & Lomb objective. 



J. E, WHITNEY, Rochester, N. 1'. 



WANTED.— Diatoms on Algae or in muds from all the tropical sea shores, especially from 

 Puget Sound, Pensacola, Campeaeh Bay, Tampa Bay, and fossil earths from Petersburg, 

 Popleine, Virg. Kappahanock Cliff, Piseataway. 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 diatomaceous earths or other microscopical material, prepared or 

 cru de, for exchange, please communicate with M. A. BOOTH, Longmeado w. M sss. 



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

 three Caps, for sale or exchange. DR. A. C. STOKES, Trenton, N. J. 



I HAVE for exchange Stellate Hairs of Plants. Pollen, and Seeds; also various Diatoms, Polycls- 

 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 ALGiE, 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 

 T WILL exchange good histological for^other first-class mounts^ 



Price, 87.50. C. H. STOWELL. 



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., Ger man Hospital, Philadelphia, Pa. 



TDLEASE announce that I will supply labels, cards, and otlwr first-class printing injsxchange for 



good slides^ EUGENE P1NCKNEY, Dixon, HI. 



CARI INSECTS, pathological and other well mounted slides, in exchange for Pleurosigi 

 Trichina, Diatoms, Stained Bacteria, etc. J. O. STILLSON, Indianapolis, Indiana. 



A CARI INSECTS, pathological^and other well mounted slides, jn exchange for Pleurosigma, 



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

 DR. W. R. CH1TTICK, 83 Lafayette Avenue, D etroit, 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. C. H. STOWE L L, 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 diatomaceous material containing Bacillaria Paradoxa— all liv- 

 ing— in exchange for well mounted slides. J AS. C. L ATHROP, Bridgeport, C onn. 



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

 specimens of interest. Lists furnished on application. 



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



