THE MICROCOSM. 



MINERALOGY, GEOLOGY, ZOOLOGY. 



RELIEF MAPS. 



Especial attention given to Relief Maps. All work of this kind 

 executed accurately and artistically. Can also furnish copies of 

 models made for the Government : Grand Canon of the Colorado, 

 Yosemite Valley, Wasatch and Uinta Mountains, Mt. Taylor, 

 Mt. Shasta, Leaclville, Eureka, etc., etc. Also model of the whole 

 United States with ocean bottoms adjoining, modeled on the cor- 

 rect curvature. 



MINERALS. 



My stock of minerals is very large and complete, sold as indi- 

 vidual specimens or systematic collections of all sizes. The $100 

 collection is adapted to the higher grade of Academies. 



METEORITES. 



If you wish to buy or sell meteorites or to have them cut and 

 polished write me. 



ANATOMICAL MODELS, TAXIDERMY, &c. 



EDWIN E. HOWELL, 



537 15th St., N. W. Washington, D. O. 



BEOKIER BROTHERS, 

 'No. 6 Murray Street, Hew York, 



Manufacturers of Balances and Weights of Precision for Chem- 

 ists, Assayers, Jewelers, Druggists, and in general for every use 

 where accuracy is required. 



AMERICAN JOURNAL OF SCIENCE. 



Founded by Professor Silliman in 1818. 



Devoted to Chemistry, Physics, Geology, Physical Geography, Mineralogy, 

 Natural History, Astronomy, and Meteorology. 



Editors: James D. Dana and Edward S. Dana. 



Associate Editors: J. P. Cooke, Jr., George L. Goodale, and John Trow- 

 bridge, of Cambridge, H. A. Newton and A. E. Verrill, of Yale, and G. F- 

 Barker, of the University of Pennsylvania, Philadelphia. 



Two volumes of 480 pages each, published annually in MONTHLY NUMBERS. 



This Journal euded its first series of 50 volumes as a quarterly in 1845, and its 

 seayad series of 50 volumes as a two-monthly in 1870. The monthly series com- 

 menced in 1871. 



Twenty copies of each original communication are, if requested in advance, struck 

 off for the author without charge ; and more at the author's expense, provided the 

 number of copies desired is stated on the manuscript or communicated to the 

 printers of the Journal. 



