





ig Scientific Text-Books 
YOUNG’S ASTRONOMIES 
PROFESSOR Young'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 style, and clearness of statement which belong to every successful 
text-book. 
Lessons in Astronomy, Revised Edition. Manual of Astronomy. 
NM of Astronomy. General Astronomy. 
BERGEN'S BOTANIES 
BERGEN’S botanies were the first to combine a er text, a prac- 
The c 
tical Toy course, and a key for systematic w 
bination of these three things brought them at once Sr a reading 
x Dose 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 
pus use in Botanical Laboratories. 
WILLIAMS’ CHEMISTRIES 
K addition to being a accurate, the author’s textbooks 
emistry are inter resting and attractive 7 
ee of Chemistry. Chiaia Exercises. ee 
- Introduction to Chemical Science. Chemical ee = 
| BLAISDELL'S PHYSIOLOGIES. 

