2 4 o THE MICROSCOPE. 



EXCHANGES. 



(Exchanges are inserted on this page without charge. Subscribers having 

 microscopic apparatus for sale or exchange can announce the same without 

 charge.) 



DIATOMS ON ALGA. Achnanthes bevipes, etc., Polycistana, Fossil 

 Diatoms, etc., Sertularia Pluma, Sertularia Crustata, etc. Spore cases of 

 Fern too numerous to mention, to exchange for well mounted objects. WM. 

 FARNELL, Macon, Ga. 



FOR SALE. — Ross Binocular Microscope, 6 objectives and full accessories, 

 cost originally, $650. Address, J. G. Langguth, 135 Wabash Ave., Chicago. 

 Also a large "'Beck Binocular, $600 outfit," cheap. 



I HAVE quite a collection of histological mounts which I should like to ex- 

 change for other good slides. E. M. WATERBURY, M. D., Saratoga 

 Springs, N. Y. 



EXCHANGE. — I have a large number of vegetable mounts, single and 

 double staining. Would like to exchange for any specimens of interest. 

 MISS L. M. BERKEY, Grand Rapids, Mich. 



A HOMOGENEOUS immersion (works also dry, water or glycerin) 1-1 5, 

 1S0 adjustable, to exchange for a higher power. A. Y. MOORE, 57 

 Prospect st., Cleveland, Ohio. 



FOR SALE OR EXCHANGE for objectives or accessories, one copy Car- 

 penter's "The Microscope and its Revelations," also Dana's "Manual 

 of Geology." Both books are new and latest editions. Cost $10.50. H. F. 

 WEGENER, Denver, Colorado. 



NA. RICHARDS, of St. Louis, Mich., has for exchange a few mounts 

 4 of double-stained and single-stained vegetables; also a number of well- 

 mounted injected specimens. 



WILL EXCHANGE a June or December, 1881, number of this journal for 

 a February number. 1881, or will pay cash for same. D. M. COOL, 

 Faribault, Minn. 



PLEASE ANNOUNCE that I will supply labels, cards, and other first-class 

 printing in exchange for good slides. EUGENE PINCKNEY, Dixon, 111. 



EXCHANGE. — Untreated diatoms and miscellaneous material in large 

 variety to exchange for good prepared material for mounting of any kind. 

 M. A. BOOTH, Longmeadow, Mass. 



FOR SALE. — One Tolles' 4-10 objective of ioo° adjustable; also one 1% 

 inch objective of 23° bv William Wales. Both made to order and first— 

 cl ass. A. L. WOODWARD, Syracuse, New York. 



ACARl INSECTS, Spermatozoa of Horse. Pathological and other well 

 mounted slides in exchange for Pleurosigma, Trichina, Diatoms, Stained 

 Bacteria, &c, &c. J. O. STILLSON, 504 Upper 2d St., Evansville, Indiana. 



AVE a large number of histological mounts for exchange. T. B.. 

 STOWELL, Ph. D., Cortland, N. Y. 



WILL exchange good, histological for other first class mounts. S. G. 

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



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