GRAY'S BOTANICAL TEXT-BOOK 



CONSISTS OF 



VOL. I. STRUCTURAL BOTANY. By ASA GRAY. 



II. PHYSIOLOGICAL BOTANY. By GEORGE L. GOODALE. 



III. INTRODUCTION TO CRYPTOGAMIC BOTANY, BOTH 



STRUCTURAL AND SYSTEMATIC. By WILLIAM G. 

 FARLOW. {In preparation.) 



IV. SKETCH OF THE NATURAL ORDERS OF PH^ENOGAMOUS 



PLANTS; their Special Morphology, Useful Pro- 

 ducts, &c. {In preparation.) 



