CONTENTS. 



PAGE, 



Table of Contents iii 



L18T OF Members. Revised to December 31, 1902 v 



1. Patrons. 



2. Active Members. 



History of the Academy (Abstract) xiii 



Rbcord. January 1 to December 31, 1902 xvii 



Papers Published. January 1 to December 31, 1902: 



1. Alexander S. Chessin. — On the true potential of the 



force of gravity. — Issued January 29, 1902 1 



2. K. K. Mackenzie and B. F. Bush. — The Lespedezas 



of Missouri. — Plates I.-IV. — Issued March 19, 

 1902 11 



3. Alexander S. Chessin. — On the motion of gyro- 



scopes. — IssuedMay 13, 1902 21 



4. J. B. S. Norton. — Notes on some plants of the 



Southwestern United States. — Plates V.-VIII. — 

 Issued May 14, 1902 35 



5. C. F. Baker. — A revision of the Elephantopeae. — 



I. — Plate IX. — Issued May 20, 1902 43 



6. B. F. Bush. — The North American speoies of Chaero- 



phyllum. — The North American species of Tri- 

 odia.— Plates X. -XI. — Issued June 9, 1902 57 



7. K. K. Mackenzie and B. F. Bush. — New plants from 



Missouri. — Plates XII.-XVII. — Issued June 9, 

 1902 79 



8. J. B. S. Norton. — Sclerotinia fructigena. — Plates 



XVIII.-XXL— Issued August 25, 1902 91 



9. Alexander S. Chessin. — On some relations between 



Bessel functions of the first and of the second 



kind. —Issued November 24,1902 99 



10. Title-page, prefatory matter and index of Vol. 



XII. — Record, January 1 to December 31, 1902. — 



Issued February 9, 1903. 



List of Authors 109 



General Index 110 



Index to Genera Ill 



