NEW CATALOG °f MICROTOMES 



Containing full descriptions 

 and Photographic Illustrations 

 of our entire line of remodeled 

 microtomes and accessories, 

 including several 



NEW MICROTOMES 



This new series is the most 

 complete and practical ever 

 listed, and every user of a 

 Microtome should have a 

 copy of the book for refer- 

 ence purposes, if for no 

 other reason. Mailed free. 



Bausch & Lomb Optical Co. 



Naturalists' and Arch&ologists' Field Trips 



We offer field trips from June to September for Entomologists, 

 Zoologists, Botanists, and Archaeologists, in the most interesting 

 region on the continent for zoological, botanical, and archa-ological 

 collecting, — the Sierra Madre of Northwestern Mexico, — at the 

 season when this collecting is at its best. Here tropical, temperate, 

 and boreal types of insects, reptiles, birds, animals, and plants inter- 

 mingle, and wonderful cave and cliff dwellings rich in antiquities occur. 



We furnish saddle and pack horses, camp and cooking outfits, 

 guides and board in camp at reasonable prices. You need bring 

 only your collecting outfit and personal effects. 



We are now open to book a limited number of persons for the 

 coming season in each of the principal lines above mentioned. Each 



Townsend=Barber Taxidermy and Zoological Co. 



