Prof. GANONG'S 



APPARATUS FOR 

 PLANT PHYSIOLOGY 



Manufactured by us under his directions. 



Adopted by many Advanced Workers, including Government and 

 Forestry Departments, "Botanical & Agricultural Colleges, etc., 



throughout the World. 



n 



The LATEST CATALOGUE includes 10 new and important 

 pieces of apparatus, making 26 in all. If you have not 

 already received it, please write for Catalogue "PDV 5." 



Also particulars of MICROSCOPES (over 100,000 Bold), MICROTOMES, PHOTO- 

 MICROGRAPHS and DRAWING APPARATUS, PROJECTION APPARATUS, 

 CENTRIFUGES, YISCOSIMETERS, etc., on application. 



N.B.— All our Instruments being made at our own 

 factory in Rochester, N.Y., there will be no delay 

 in delivery, and we have just received large stocks. 



%m*h* 



Traxb Mark. 



OPTICAL COMPANY 

 37-38, Hatton Garden, London, E.C- 



OR THROUGH ALL DEALERS. 



( viii ) 



Trade Mark. 



