(.'RAY'S NEW MANUAL 

 ( ) F B O T AN Y — S E V E N T H 

 EDITION, ILLUSTRATED 



Thoroughly revised and largely rewritten bv BENJAMIN 

 LINCOLN ROBINSON, Ph.D., Asa Gray Pi 

 of Systematic Botany, and MERRITT LYNDON 

 FERNALD, S.B., Assistant Professor of Botany, Harvard 

 University, assisted by specialists in certain groups. 



Regular edition. Cloth, 8vo, 026 pages $2.50 



Tourist's edition. Flexible leather, 1 :mo, 926 pages. . . . 300 



Largely rewritten and rearranged, with its scope consider- 

 ably widened. The nomenclature follows the code of inter- 

 national rules recently adopted in Europe. As now pub- 

 lished, it presents in clear and well-ordered form the scattered 

 results of diffuse publication, and treats its subject with due 

 consideration for the results of the latest investigation. 



AMES'S TEXT-BOOK OF 

 G E N E R A L PHYSICS 



For use in colleges. By JOSEPH S. AMES, Ph.D., Pro- 

 fessor ol Physics and Director of the Physical Labora- 

 tory, [ohns Hopkins University. 



Cloth, 8vo, -68 pages, illustrated . #3.5° 



A one year college course, stating the theory of the sub- 

 ject clearly and logically, and giving a concise summary or 

 the experimental tacts on which the science of physics is 

 based. Every important experiment and observation is men- 

 tioned and explained, and the few great principles of nature- 

 are given the prominence they deserve. 



A M E RICAN BOOK C O M PA N V 



