


Leading 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. 
Elements of Astronomy. General Astronomy. 
BERGEN'S BOTANIES: 
BERGEN'S botanies were the first to combine a standard text, a prac- 
ticallaboratory 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 s Text-books of Botany or for 
general use in Botanical Laboratories. 
WILLIAMS' CHEMISTRIES 
Ir addition to being scientifically accurate, the author’s text-books 
: on chemistry are interesting and attractive. 
. Elements of Chemistry. Chemical Exercises. 
Introduction to Chemical Science. Chemical Experiments. 
a = BLAISDELL’S PHYSIOLOGIES. 

Bene: LL! E. s physiologies lave maintained a remarkable popularity Se 
-in the edu ational world. The books present in clear and 
language the latest and most trustworthy facts on physiology xut Se 
~ hygiene. Special attention is given to the subject of the care and — — 
- preservation of the health. Important facts are illustrated by a — 
ries of simple experiments which the pupil can perform with little 
r no outlay for apparatus. This feature is peculiar to the ee: zu 
books and has = 

ot of He found no less ee i ed en 
- (Revised Edition. = 
Bi se s and How | n. e en Edition. 2H 
Health. 





















