















Leading Scientific Text-Books 
YOUNG'S ASTRONOMIES 
PROFESSOR Younc’s position among the great astronomers of the 
world is firmly established. As a clear and forcible writer he is 
equally well known. His series of astronomical text-books combines 
in an unusual degree the qualities of accurate scholarship, simplicity 
of we and clearness of statement which belong to every successful 
k. 
Rn in en Revised Edition. Manual of Astronomy. 
Elements of Astronomy. General Astronomy. 
BERGEN'S BOTANIES 
BERGEN’s botanies were the first to combine a standard text, a prac- 
tical laboratory course, and a key for systematic work. The com 
bination of these three things brought them at once into a leading 
position among botany texts,—a position they have since maintained. 
Elements of Botany, Revised Edition (now ready). 
Foundations of Botany. 
_ Notebook to accompany Bergen's Text-books of Botany or for. 
en use in Botanical Laboratories. 


WILLIAMS’ CHEMISTRIES 
- IN addition to being scientifically — the author’s text-books 
on chemistry are interesting and attractiv 
_ Elements of Chemistry. " phaniéal Exercises. 
Introduction to Chemical Science. Chemical Experiments. 
 BLAISDELL'S Side oai 



kabl popularity 
al s "he gae int in clear and simple - 
| and most trustworthy facts on physiology and 
Ale = mc t seeds care und 




