u 



SCIENGE.—AD TEE 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 iMicroscopic) 

 OF ROCKS, MINERALS, FOSSILS, ETC., 



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

 ranged collections, with descriptive commentaries (prepared by 

 experienced litholo^ists). Corresponding rocli specimens. 



GRINDING MACHINES 

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

 etc. Of best construciion, but low in price: adapted to slicing 

 and polishifig all rock substances hard or .soft : with suitable laps 

 for preparation of thin sections for microscope. Send for circulars^ 

 eUSTAVUS D, JULIEN, 932 Bloomfield St., Hoboken, New Jersey. 



The Microscope and Microscopical Methods 



SiJ^th Edition. Fidhj HUistrated. 

 By SIMOiN HENRY GAGE, of Cornell University. 



This book is a product of the laboratory and is designed 

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

 Ecope 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 ISSZ'ED. 



CRELLE, Calculating Tables. 



First English edition giving products of every two 



numbers from 1 to 1000. 



Folio, clotli bound, S5.00 



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 



LIVING PLANTS and their Properties 



By Professor J. C, ARTHUR. Purdue University, and Professor D, T. MacDOUGAL, University of Minnesota. 



A book of 12 independent essays dealing vrith such subjects as special senses of plants, influence of cold, 



significance of color, comparisons between plants and animals, etc. 



Enamelled Paper, Marginal Sub-Titles, 30 Illustrations, 343 Pages, 8vo, handsomely 



bound in Clotli. Price, SI. 35 postpaid. 



COMMENTS. 



"It is a collection of delightftilly written essays on certain of the more important and Interesting features of 

 living plants in the broadest sense," — Plant World. 



" A most attractive, popular presentation based upon sotmd, scientific knowledge,"— Paitl Caevs, 



"The book will make an interesting addition to the scientific alcove of every public library."— Prof. C, E. Bessey. 



"The authors consistently indicate the fundamental identity of animals and plants and show that this is due 

 to their having the same living substance as their physical basis of existence." — G, J. Pierce, 



MORRIS & WILSON, 



University Book Store, MINNEAPOLIS, MINN. 



BAKER & TAYLOR CO., 



5 and 7 East 16th Street, NEW YORK CITY. 



WIVI. GAERTNER & CO., Scientific Instrument Works 



X5S-156 I'l«ry-S±3.tla. St., C;:^ICA.C3rC^, 



Manufactorers of ASTKOXOMJCAI, AKD PHYSICAL APPAKATUS of modem design and high-grade -n-ork^ 

 jnanship. SPECIALTIES: Equatorial Telescopes, Micrometers, Spectroscopes, Linear and Circnlar Dividing 

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



Universal Laboratory Supports. 



References from Leading Scientists. Catalogue on Application. 



MINERALS. 



Extra Fine Cabinet Specimens. 

 ^ Rare Species. 1-oose Crystals, 



^^^^ Cheap Educational Specimens. 



Systematic Collections. 



Blowpipe Minerals by the Pound. 



Our Stock greatly enriched by Mr. English's Recent Tour of Europe. Write for full particulars, and for free 

 Price Lists and Bulletins. 124 pp. Catalogue (87 cuts) describing every species, 25c. in paper, 50c. in cloth. 



GEO. li. ENGLISH «to CO., Mineralogists, 64 E. 12tli St., New York. 



