80 THE AMERICAN MONTHLY. [Maich 



WANT, SALE, AND EXCHANGE NOTICES. 



[These notices will be given six insertions in this column at 25 cents per line or fraction thereof.] 

 WANTED. — Diatom material from America, Australia, and Asia in exchange for fossil and recent 

 material from Denmark. 



CHR. MICHELSEN, 33 Nedergade, Odense, Denmark. 



FOR EXCHANGE.— Slides of diatoms from peat bogs in Boston, Mass. 



F. F. FORBES, Brookline, Mass. 



WANTED TO PURCHASE.— Histological slides from normal tissues of mammals, prepared with 

 a view to show the size of the " cells," in cases where the age of the animal-subject is definitely known, 

 as bearing on the question of a supposed diminution in the size of cells in aging organisms, correspond- 

 ing to a similar decrease, reported by Balbiani and Maupas in aged unicellular life. Address, 



C. A. STEPHENS' LABORATORY, Norway Lake, Maine. 



TO MICROSCOPISTS.— After July i the price of my well-known .slides will be the uniform one of 

 50c. each, §5.00 per dozen. Send 2c. stamp for catalogue and 50c. for .slide of Podura scales, test, or 

 other diatoms, or of miscellaneous objects. Thum's " Oh, My !" slides of arranged diatoms, gorgeous 

 butterfly scales, etc., at lowest rates. 



M. A. BOOTH, F. R. M. S., Longmeadow, Mass. 



FOK SALE. — Spencer's i-in. 40° objective ; first-class series; new; and Spencer's xV-in- i'3° R- 

 A. homo. imm. Professional series; has been used, but is in perfect order. Reason for selling, bad 

 health and tailing eyesight. 



THOS. H. URQUART, M. D., Hastings, Neb. 



WANTED.— Vol. VII. No. 2 (Feb., 1886), of American Monthly Microscopical Journal. 



A. G. YOUNG, State House, Augusta, Me. 



FOR EXCHANGE.— Well-mounted slides. Mostly histological objects and diatoms. Lists furn- 

 ished. H. W. WESTOVER, M. D., St. Joseph, Mo. 



WANTED. — A Powell & Leiand grand stand. Address, stating price and condition, 



G. S. WOOLMAN, 116 Fulton St., N. Y. 



WANTED. — To buy a second-hand Microscope. Must be in perfect order and a bargain. 



R. S. W., Box 630, Washington, D. C. 



SLIDES FOR EXCHANGE.— Very nice sections of silicified wood from Colorado, showing cell 

 markings similar to those of the conifers. C. W. SMILEY, Washington, D. C. 



FOR SALE. — Type plates of Diatoms. 50 species, $3.00 ; 100 species, $6.00. Mounts of single spe- 

 cies from 40 cents up. .Send 40 cents for specimen. I have also some choice spread slides for 40 cents 

 each ; S4.00 per doz. Diatoms mounted to order, and all work furnished promptly. Catalogues on ap- 

 plication. D. B. WARD, M. D., Poughkeepsie, N. Y. 



WANTED.— A Bulloch Professional Stand. Address, stating price,— 



HENRY C. WELLS, 151 Broadway, New York City. 



FOR EXCHANGE.— Slides of diatoms for other mounts or diatomaceous material. 



F. F. FORBES, Brookline, Mass. 



FOR EXCHANGE.— First-class "Edison's Electric Reduplicating Pen," cost $35. Want any 

 Microscopical accessories or slides not already in my cabinet. Address — 



O. P. PHILLIPS, Wellington, Kans. 



WANTED.— Barbadces earth in quantity. Good mounts in exchange. 



FRED'K B. CARTER, 61 Church St., Montclair, N. J. 



WANTED. — To buy a second-hand Microscope. I prefer the Binocular, late style; must be in perfect 

 order and a bargain. R. G. W. Jewell, Box 56, Summit, Miss. 



FOR SALE. — I No. 546 Universal stand and accessories. 1 I'j and i ^V new Spencer H. I objectives. 

 I Surveyors' Solar compass, i pocket Aneroid Barometer — for cash. Photo apparatus, or Projection 

 Lantern. W. N. SHERMAN, M. D., Merced, Caj 



NOTICE. — I have undertaken with the approval of Professor Gage to prepare an exhibition of the 

 Crustaieous Parasites of North American fishes as a part of th'% practical work of the American Micro- 

 scopical Society at Chicago in 1893.^ In order that the display may be as complete as possible I respect- 

 fully ask members of the American Society and others to send me examples of any species that they may 

 be able to spare for the purpose. The fullest data are desired. I would like to correspond with any one 

 having books, pamphlets, or specimens of the sort to dispose of. D. S. KELLICOTT, Columbus, Ohio. 



