W'ard's Natural Science Establishment 



A Supply-House for Scientific Material. 



Founded 1862. Incorporated 1890. 



A few of our recent circulars in the various 

 departments : 



Geology: J-32. Descriptive Catalogue of a Petrographic Col- 

 lection of American Rocks. J- 188 and supplement. 

 Price-List of Rocks. 



Mineralogy: J-220. Collections. J-225. Minerals by Weight. 

 J-224. Autumnal Announcements. 



Paleontology: 3-201. Evolution of the Horse. J-199. Palae- 

 ozoic index fossils. J-115. CoUeciions of Fossils. 



Entomology: 3-%^. Supplies. J-229. Life Histories. J-230. 

 Live Pupae. 



Zoology: J-223. Material for dissection. J-207. Dissections 

 of Typical Animals, etc. J-38. Models. 



Microscope Slides: J-189. Slides of Parasites. J-29. Cata- 

 logue of Slides. 



Jaxidermy : J-22. North American Birdskins. Z-31. General 

 Taxidermy. 



Human Anatomy : J-37. Skeletons & Models. 



General : J-228. List of Circulars & Catalogues. 



Ward's Natural Science Establishment 



84-102 College Ave., Rochester, N. Y., U. S. A. 



"SCIBNTIA" 



INTERNATIONAL REVIEW OF SCIENTIFIC SYNTHESIS. Issued monthly {each 

 number consisting of 100 to MO pages). Editor : EUGENIO RIQNANO. 



This is the only review which has a really international collaboration ; which is 

 of world-wide circulation and occupies itself with the synthesis and unification of 

 knowledge, in the history of the sciences, mathematics, astronomy, geology, physics, 

 chemistry, biology, psychology and sociology. 



This Review studies ail the most important questions— demographic, ethnographic, 

 economic, financial, juridical, historical, political— raised, by the world war. 



It has published articles by Messrs. : Abbot °>Arrhenius -Ashley - Bayliss-Belchman- 

 Bigourdan - Bohlln - Bohn = Bonnesen - Borel = Booty = Bragg - Bruni = Burdick = Carver - 

 Caullery - Chatnberlin - Charller •- Ciaparede - Clarlc - Costantin - Cromtnelin ° Crowter - 

 Darwin - Delage = De Vrles = Durkheim =■ Bddington - Edgeworth = Emery = Enriques - 

 Fabry - Plndlay - Fisher = Fowler = Qolgi = Gregory - Harper •= Hartog = Helberg - Minks - 

 Hopkins=Inigues-Innei=Janet=Kaptein=Kaye=Kidd-Langevin=Lebedew=Lloyd Morgan = 

 Lodge - Loisy- Lorentz - Loria =Loweli - MacBride =■ Meillet =Moret-Muir=Peano =Picard - 

 Poincare-Pal8eux = Rabaud = Rey Pastor- Righi=Rignano-Ru8sell=Rutherford=Sagnac = 

 Sarton = Schiaparelli - Scott - See = Sherrington - Soddy = Starling =■ S vedberg » Thomson - 

 Thorndike-Turner-Volterra -Webb -Weiss = Zeeman=Zeuthen and more than a hundred 

 others. 



'•SCIENTIA" publishes its articles in the language of its authors, and joins to the 

 principal text a supplement containing the French translations of all the articles that 

 are not in French. (Write for a Specimen Number to the General Secretary of 

 ''Scientia'', Milan.) Annual subscription : 40 sh., or 10 dollars post free. 



Olfice : 43 Poro Bonaparte, Milan, Italy. 



Publishers: WILLIAMS & NORGATE- London; FELIX ALCAN-Pads 



NICOLA ZANICHELLI- Bologna; WILLIAMS & 



WILKINS co-Baltimore, 



