SCIENCE-ADVERTISEMENTS 



OUR 1913 CATALOG 



itaina many new instruments, all i 



u^„ illustrationB, lowest prices and 



^ valuable information of interest to every ^ 



]S science instructor. Send us your name . 



^ and address and we w ill send you a free * 



i copy. 



ROMEIKE'S 



PRESS CLIPPINGS 



are now an absolute necessity for every scientific man. 

 By methodical searching through the most important 

 papers and periodicals published in this country and 

 abroad we are able to supply you at short notice with 

 information on any subject which perhaps you would 

 be nnable to find yourself in libraries or reference 

 books after spending days or even weeks at such a 

 task. Write for further information. 



HENRY ROMEIKE, Inc. 



06-1 10 Seventh Avenue New York City 



Formation of Coal Beds 



By JOHN J. STEVENSON 



Emer. Professor of Geology, New York University. 



Reprinted, with index, from Proc. Amer. 

 Phil.Soc. 1911-1913. 



8vo.. cloth, pp. vii+ 530. Price, $3.50 net. 



G. E. Stechert and Company, 



151-155 West 25tli Street, New York City 



PROVIDENT TEACHERS' AGENCY 

 120 Tremont Street BOSTON, MASS. 



We enroll and we recommend teachers and officers 

 for public and private schools, for normal and tech- 

 nical schools, and for colleges and universities. 

 Vacancies now for immediate service and for 1914- 

 15. Director, JAMES LEE LOVE, formerly of 

 Harvard Faculty. 



i 1 



Apparatus 



Motion Picture Camera 



For taking Serial Photographs oi 

 living micro-organisms 



using regular (standard) size film 



Adaptable to any good miorophotographio 

 Apparatus 



Ordinary motion pictures can be made with 

 it as well. 



For Research Work 

 as well as Lecture Purposes 



riolion Picture Cameras 



are 



lis 



Circulrr on apparatus illustrated, and the 

 booklet "Kino Science " on request. 



Imported by 



MAX MEYER 



18 W. 27th St., New York 



Importer of and Dealer In 



Maropean Cameras and Scienti&e 

 Instruments 



