48 THE AMERICAN MONTHLY. [February. 



The last ten years have seen a revolution in the opinion of scholars as 

 to the region in which the Aryan race originated, and theories which 

 not long ago were universally accepted as the well-established conclu- 

 sions of science now hardl}' find a defender. The theory of migration 

 from Asia has been displaced by a new theory of origin in Northern 

 Europe. In Germany several works have been devoted to the subject, 

 but this is the first English work which has yet appeared embodying the 

 results recently arrived at by philologists, archceologists, and anthi-opo- 

 logists. This volume affords a fresh and highly interesting account of 

 the present state of speculation. 



STTBSCRIBERS' NOTICES. 



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



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



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



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. — Vol. I, American Monthly Microscopical Journal. 



C. K. WELLS, Marietta, Ohio. 



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. 



FOR SALE. — J30. I L. Schrauer miscroscope with eye-pieces A and C; movable glass stage and 

 double nose-piece; cost,S6i. 



H. C. BENNETT, 256 West 42d St., New York City. 



FOR EXCHANGE.— Slides of selected diatoms. D. B. WARD, Poughkeepsie, N. Y. 



OFFERED.— Diatomaceous Earth from Utah (Desert) for Histological Mounts. 



PROF. ORSON HOWARD, Salt Lake City, Utah. 



CORRESPONDENCE invited with a view to the e.xchange of either mounted orunmountedOribatida 

 (British) for American species. E. BOSTOCK, Stone, Staffordshire. 



WANTED. — Any works on Microscopy not already in my Library. 



H. M. WHELPLEY, F. R. M. S., St. Louis, Mo. 



First-class Histological Slides for other good mounts ; Histological and Pathological material cut on 

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



FOR SALE CHEAP. ^New Gundlach ^^ homogeneous-immersion objective, for 5\j glycerine ot 

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



FOR SALE. — Beautiful photo-micrographs of P. angulatum. Only 25 cents each. 



J. E. BAKER, M. D., Wyoming, Ohio. 



FOR SALE OR EXCHANGE. — Mosquitoes, male and female. Price 75 cents each. Will ex- 

 change only for first-class mounts. E. W. SHARP, 2800 Richmond St., Philadelphia, Pa. 



A $5 MICROSCOPE. — Made on proper scientific principles. Magnifies too diameters or 10,000 

 times. For other interesting articles send for list of Popular Scientific Specialties. 



G. S. WOOLMAN, 116 Fulton St., New York. 



SPECIAL BARGAIN in histological slides. 



WM. N. BEGGS, M. D., 2207 Sidney St., St. Louis, Mo. 



FOR SALE OR EXCHANGE. — Photo-micrographs of P. angulatum taken through Spencer's 

 f'5 H. I., 2400 diameters. Also photo-micrographs of bacteria, diatoms, etc., 25 cents each. Will ex- 

 hange for well-moun ted slides. Dr. J. E. BAKER, Wyoming, Ohio. 



