American Science Sertes 
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 Grorce F. BARKER. x-+902 pp. $3.50. 
Chemistry. 
By IrA Remsen, President of the Johns Hopkins University. 
Advanced Course. xxii +853 pp. $3.00. 
College Chemistry. xx +4689 pp. $2.25. 
Briefer Course. xxiv+516 pp. $1.25. 
Elementary Course. x +287 pp. 80 cents. 
Laboratory Manual. xii+196 pp. 50 cents, 
Chemical Experiments. x-++160 pp. 50 cents, 
Astronomy. 
By Simon NEwcoms and Epwarp S. HoLpEN. 
Advanced Course. xii-+-512 pp. $2.00. 
Briefer Course. x+366 pp. $1.20. 
Elementary Course. xv+446 pp. $1.20, 
Geology. 
By Tuomas C, CHAMBERLIN and ROLLIN D. SALIsBURY, 
Professors in the University of Chicago. 3 vols. 8vo. 
Advanced Course. 3 vols, 8vo, 
Vol. I, Géological Processes and their Results, xix 
+654 pp. $4.00, 
Vols, lL and III, Earth History, xxxvii+1316 pp. 
(Not sold separately.) $8.00, 
College Text-Book of Geology. xvi+978 pp. $3.59. 
Physiography. : 
By Rotiin D, Sauissury, Professor in Chicago University, 
Advanced Course, xx+770pp. $350. 
Briefer Course. viii+531 pp. $1.50. 
Elementary Course. xi+359 pp. $1.30. 
