11 



SCIENCE.— AD VER TISEMENTS. 



SEPARATA of the papers of the late 

 Professor E. D. COPE are now for 

 sale. Price list can be obtained by ap= 

 plying to Mrs. E. D. Cope, Haverford 

 College, Haverford, Pa. 



THIN SECTIONS (Microscopic) 

 or ROCKS. MINERALS, FOSSILS, ETC.. 



carefully mounted, and for sale at selection from list or in ar- 

 ranged collections, with descriptive commentaries (prepared by 

 experienced lithologists). Corresponding rock: specimens. 



GRINDING MACHINES 



with latest improvements and fitted to foot power, electric motor, 

 etc. Of best construction, but low in price; adapted to slicing 

 and polishing all roct substances hard or soft ; with suitable laps 

 for preparation of thin sections for mxroscope. Send for circulars, 

 GUSTAVUS D. JULIEN, 932 Bloomfield St., Hoboken, New Jersey! 



The Microscope and Microscopical Methods 



Sixth Edition. FuUy lUustrated. 

 By SIMON HENRY GAGE, oJ Cornell University. 



This book is a product of the laboratory and is designed 

 tor actual laboratory use. It deals with the modern micro- 

 Bcope and its accessories, microscopical methods, including 

 photo-micrography, etc., and has in view the especial needs 

 of students, teachers and professional men. Postpaid, $1,50 

 COMSTOCK PUBLISHING CO., Ithaca, N. Y. 



JUST XS8VED. 



CRELLE, Calculating Tables. 



First English edition giving products of every two 



numbers from 1 to 1000. 



Folio, cloth bouud, $5.00 



LEMCKE & BUECHNER, 



812 Broadway, New York. 



DYSPEPSIA 



Horsford's Acid Phosphate 



reaches various forms of Dys- 

 pepsia that no other medicine 

 seems to touch. It assists the 

 weakened stomach and makes 

 the process of digestion natural 

 and easy. Pleasant to take. 



For sale by all Druggists 



PKYWL, CHEMICAL, iOOSCOPICAL AND [LECTIIICAL APPARATUS. 



Established COMPLETE LABORATORY EQUIPMENT OF OUR OWN MANUFACTURE. incorporated 

 1882. X-RAY APPARATUS AND CROOKE'S TUBES A SPECIALTY. 1894. 



Catalogue P Free to Scliool ZIEGLER ELECTRIC CO., "Duty Free" Importations from 



Officials and Science Teacliers. 141 Franklin St.. BOSTON, MASS. Foreign Manufacturers. 



WJVI. GAERTWER & CO., Scientific Instrument Works 



X52-X56 E'i«y-Si3:tli St., OZZXO.^.0^0. 



Manufacturers of ASTKONOMICAI. AND PHYSICAL APPARATUS of modem design and liigh-grade work- 

 manship. SPECIALTIES: Equatorial Telescopes, Micrometers, Spectroscopes, Linear and Circular Dividing 

 Engines, Comparators, Michelson Interferometers, Bolometers, etc., etc. General Laboratory Apparatus. 

 Universal Laboratory Supports. „ 



References from, Leading Scientists. Catalogue on Application. 



" There is no part of the equipment of a modern labora- 

 tory whicli is more useful than storage cells." 



— Manual of Experiments in Physics; by Ames and Blias. 



There is no Storage Battery better made or more widely nsed than 

 the "Chloride Accumulator." 



There is no one but the undersigned, specially authorized by the 

 Electric Storage Battery Co. (makers of the "Chloride Accumulator"), 

 to solicit Laboeatoey Oedees. 



Correspondence requested. Catalogue A upon request. 



James G. Biddie, 909 Drexel Building, Philadelphia. 



