American Sctence Series 
The two principal objects of the series are to supply author- 
itative books whose principles are, so far as practicable, illus- 
trated by American facts, and also to supply the lack that 
the advance of science perennially creates, of text-books 
which at least do not contradict the latest generalizations. 
Physics. 
By A. L. Kimpaty, Professor in Amherst College. (/iz 
preparation.) 
Physics. 
By GeorcE F, BARKER. x+902 pp. $3.50. 
Chemistry. 
By Ira REmMSEN, President of the Johns Hopkins Uni- 
versity. 
Advanced Course. xxii+853 pp. $3.00. 
College Chemistry. xx+689 pp. $2.25. 
Briefer Course. xxiv+516 pp. $1.25. 
Elementary Course. xX+287 pp. 80 cents. 
Astronomy. 
By Simon NEwcoms and Epwarb $. HOLDEN. 
Advanced Course. xii+512 pp. $2.00. 
Briefer Course. x+366 pp. $1.20. 
Elementary Course. xv+446 pp. 51.20. 
Geology. 
By THomas C, CHAMBERLIN and ROLLIN D. SALISBURY, 
Professors in the University of Chicago. 3 vols. Svo. 
Vol. I. Geological Processes and their Results. xix 
+654 pp. $4.00. 
Vols. IT and III. Earth History, xxxviit+1316 pp. 
(Not sold separately.) $8.00. 
Physiography. 
By Rouuin D. SatisBury, Professor in Chicago Univer- 
sitv. 
Advanced Course. Xx +770 pp. $3.50. 
Briefer Course. vilit531 pp. $1.50. 
