crosoo 



50 Styles to Select Frtem 



Journal of Applied Microscopy $1.00 Per 

 Year 



Laboratory Apparatus 



For All Purposes 



Photographic Lenses 



For Ordinary and Microscopic Purposes 



Chemicals 



AND CHEMICAL APPAKATUS 



Estimates for Import 



Large Stock Always On Hand 



Catalogue of All Lines Free 



Bausch 8l Lomb Optical Co., 



New York Eochester, N. Y. 



Chicago 



FORTY-EIGHT 

 PAGES 



are required just to describe a lot of 

 iute resting booklets of travel, any one 

 of which caa be obtained by sending a 

 few cents in stamps. These forty-eight 

 pages make the 



ILLUSTRATED CATALOGUE 



of the 



NE^ YORK CENTRALES 

 ** FOUR-TRACK SERIES^ 



Embracing 37 Books of Travel. 



A copy of thia catalogue will be sent 

 free, post-paid to any address on receipt 

 of a two-cent stamp, by 



GEORGE H. DANIELS, 



Gen'l Passengzr c4gent, 

 Grand Central Station N&w. York. 



iBCFosc&gses 



rOR NATURE STUDY 



New A psar Folding Mi<>rosoope.$3,00 ; Xew 

 I>isse<'tiiigJlicrosoopp,AplMna.tielens,84.00; 

 Coiiiplete ^Indent's ilicrosi'ope reduced to 

 SS'J.OO; Beck's New Laboratory Microscope 

 lediK'ed to J36.00. Special (duty freej prices 

 to scliools. 



Botanical Supplies 



Pocket Dissecting Sets 70c. to $3.00 ; Pocket 



Lenses 25c. to S2.00; B«>tarii<3al Collecting 



Cases 7.')C. to $1.5C; Plant Presses 60c. to 



$1.5y. botanical, Entomoloci'-al and (ieo- 



loRical su!iplie«. Magic Lanterns and Slides. 



Agents for E. Leitz and R. & J. Beck's Microscopes. 



WILLIAMS, BROWN A EAELK, 



Dept. 17, S)18 Chestnut Street, Philadelplita. 



^ PSYCHOLOGICAL ^ 



^ APPARATUS J^ 



A list of psychological apparatus supplied 

 to the laboratories of Columbia, Harvard 

 and other leading universities will be sent 

 on application. 



Special apparatus and instruments for psy- 

 chological and physiological research will be 

 made to order. Designs will be submitted 

 for original apparatus for the solution of 

 special problems. 



E. HORSTMANN, 



546 Wert 125th St., NEW YORK CITY 



