Ward's Natural Science Establishment 



A Supply-House for Scientific Material. 



Founded 1862. Incorporated 1890. 



A few of oiir recent circulars in the various 

 departments : 



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

 lection of American Eocks. J- 188 and supplement. 

 Price-List of Rocks. 



Mineralogy: J-220. Collections. J-238. Minerals by Weigbt. 

 J-224. Autumnal Announcements. 



Paleontology: J-201. Evolution of tbe Horse. J-199. Palae- 

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



Entomology: J-dd. Supplies. J-229. Life Histories. J-230. 

 Live PupaB. 



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. 



Taxidermy: J-22. Nortb 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. 



"SCIENTIA" 



INTERNATIONAL REVIEW OF SCIENTIFIC SYNTHESIS. Issued monthly {each 

 number consisting of 100 to 120 pages). Editor : EUQENIO 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. 



It is the only review which, by inquiries among eminent scientists and writers 

 (on: The philosophical principles of the sciences; Fundamental astronomical and physical 

 questions of current interest; Contributions given by the various countries to different 

 branches of knowledge; Question of vitalism; Social question; International questions 

 raised by the world war), makes a study of the problems interesting scientific and intel- 

 lectual circles throughout the world. 



It has published articles by Messrs. : Abbot -Arrhenius -Ashley - Bayliss- Beichman - 

 Bigourdan - Bohlin - Bohn = Bonnesen - Borel - Bouty - Bragg - Bruni = Burdick - Carver - 

 Caullery - Chamberlin > Charlier = Claparede - Clark - Costantin - Cromtnelln - Crowter = 

 Darwin - Delage - De Vrles - Durkheim - Eddington - Edgeworth - Emery = Enriques - 

 Fabry - Flndlay - Fisher = Fowler = Qolgi = Gregory - Harper - Hartog - Heiberg - Hlnks - 

 Hopkins=Inigues-Innes=Janet-Kaptein=Kaye=Kidd-Langcvin=Lebedew -Lloyd Morgan = 

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

 Poincare - Pniseux = Rabaud = Rey Pastor - Righi = Rignano= Russell-Rutherford -Sagnac = 

 Sarton- Schiaparelli - Scott - See - Sherrington = Soddy - Starling- Svedberg- Thomson • 

 Thorndike-Turner-Volterra -Webb -Weiss -Zeeman and more than a hundred others. 



"SC1ENTIA" 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 

 ti Scientia ,, f Milan, sending, -to defray postal and other expenses. -2 Francs in 

 stamps of your country.) Annual subscription : 40 sh., or 10 dollars post free. 



Office : 43 Foro Bonaparte, Milan, Italy 



Publishers: WILLIAMS & NORG ATE - London ; FELIX ALCAN- Paris 

 NICOLA ZANICHELLI-Bologna ; RUIZ HERMANOS-Madrid; 

 WILLIAMS & WILKINS CO-Baltimore. 



