320 The Microscope. 



EXCHANGES. 



This department is for the benefit of subscribers wlio have microscopical apparatui, 

 material or books which they wish to exchange, and such wants will be inserted pree of 

 CHARQE. The number of insertions given will depend upon the number of exchanges 

 received each month. Subscribers will please yiotify us when articles have been exchanged 

 or sold. Dealers are referred to our advertising department. 



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ANTED-The Microscope, Vol. Ill, Nos. 3, 4, Sand 6; Vol. IV, Nos. 1, 2, 3, 4, 5, 6, 7, 

 8 and 9; Vol. VI, Nos. 4 and 5. Address 



PROF. H. M. WHELPLEy,St. Louis, Mo. 



FOR EXCHANGE— I offer "The Standard Natural History," six volumes, new and 

 perfect copy. In exchange for type slides of diatoms; or will sell at reduced price. 

 AddreS") A. B. AUBERT, Maine State College, Orono, Maine. 



FOR S.\LE — Beck's Popular Binocular Microscope, 5 objectives, 5 eye-pieces, mechanical 

 stage and all accessories, mounting material, slides, etc. Cost about $400. For (=ale 

 at $150. For list of apparatus, etc., address 



T. W. SMITH, 3640 Indiana Ave., Chicago, 111. 



OR SALE CHEAP — Microscope stand with four eye-pieces, cost $G0, never been used ; 

 also, Bunhen's Spectroscope, cost $75. For description and price, address 



H. S. JEWETT, M D.. 21 S. Ludlow St., Dayton, Ohio. 



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ANTED— No. 2 of Vol. I, and Nos. 3 and 5, of Vol. VI. Address this office. 



OR SALE — Photo-micrographic camera, >i pi., printing frame, and large Walmsley 



lantern, $8.00. 



LANCASTER & THOMAS, Pine St., corner 19th St., Philadelphia, Pa. 



WANTED- The following back numbers of The Micro.scope: Ail of Vol. I and Vol. II: 

 Vol. HI, No. 1; Vol. IV. Nos. 1, 2. 4. 5, 6, 7, 8, 9, 11, 12— in all, 23 numbers. For any of 

 them 1 will send a well mounted and interesting microscopical slide for each number sent 

 me, or, if preferred, a tube of cleaned diatoms instead of ihe slide. 



M S. VVIARD, New Britain, Conn. 



OR EXCHANGE -A collection of seeds, botanical and miscellaneous material, for 

 diatoms, either mounted or in tubes. W. F. ROCHELLE, Jackson, Tenu. 



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ANTED— The Microscope, Vol. 6, Nos. 2. 3, 4 and 5. Address 



H M. WHELPLEY, 2»J47 Olive St.. St. Louis, Mo. 



FOR EXCHAJJGE— 1 have a limited number of slides of each of the following: Strychnia 

 Chromate (Strychnia 1-250 gr.) and Strychnia Ferri Cyanide (Strychnia 1-lOOgr.) whico I 

 will exchange for other slides, •• botanical " preferred. Onlv first-class slides offered or 

 desired. L. A. HARDING, Fergus Falls, Minn. 



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OR EXCHANGE— Slides of named diatoms. 



H. W. WESTOVER St. Joseph, Mo, 



FOR EXCHANGE— The best and most convenient drying clip ever made, for good 

 mounted slides. These clips are in use by some of the best workers, and once tried 

 are a necesi=ity. Also light saws for bone sections for exchange. 



l<\ VV. LOWDER, Sioux City, Iowa. 



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ILL EXCHANGE for objectives or other microscopical appliances, a Standard 

 Columbia Bicycle, 48 in. large wheel, in good condition Address 



J. R. CHATHAM. Xenia, 111. 



FOR EXCHANGE— A Maynard Creedmoor Rifle and loading tools, all In good condition, 

 for a microscope of some reliable make— Bausch & L-rnb's Investigator or Physicians' 

 preferred. For further particulars, address 



J. H. BARR, Box 1471. Rockford, 111. 



ANTED TO PURCHASE — Copies of works on microscopy not already in my library. 

 H. M. WHULPLEY, 2647 Olive St., St. Louis, Mo. 



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WANTED— A polariscope to fit large stand; Bausch & Lomb No. 10 bb. preferred. Also 

 sub stage condenser. Address, stating price wanted, 



ERNEST P. DEVILLE, No. 75 Royal St., New Orleans, La. 



WANTED TO EXCHANGE— For histological slides of human tissues. Have on hand 

 slides of necturus and turtle blood corpuscles, embryonic mole and various cat 

 tissues. Address T. D. WOOD, Box 322, Sycamore, Ul. 



