CONTENTS. 



PAGE. 



Table of Contents iii 



List of Members. Revised to Dec. 31, 1898: 



1. Patrons v 



2. Active Members v 



History of the Academy (Abstract) xiii 



Record. January 1 to December 31, 1898 xvii 



Papers Published. January 1 to December 31, 1898: 



1. Francis E. Nipher. — A method of measuring the 



pressure at any point on a structure, due to wind 

 blowing against that structure. — Plates I. -II. — 

 Issued January 14, 1898 1 



2. Hermann von Schrenk. — The trees of St. Louis as in- 



fluenced by the tornado of 1896. —Plates III. -IX.— 

 Issued January 29, 1898 25 



3. Charles Robertson. — New or little known North 



American bees. — Issued March 3, 1898 43 



4. A. S. Hitchcock. — Ecological plant geography of 



Kansas. — Issued March 8, 1898 55 



5. Frank Collins Baker. — Themolluscan fauna of West- 



ern New York. — Plate X. — Issued March 22, 1898.. 71 



6. Calvin M. Woodward. — The efficiency of gearing 



under friction. — Issued- May 10, 1898 95 



7. Carl Kinsley. — Discussion of series dynamo-electric 



machines. — Issued May 20, 1898 107 



8. Edmund A. Engler. — The normal to the conic sec- 



tion. — Issued July 15, 1898 137 



9. Walter C. G. Kirchner. — Contribution to the fossil 



flora of Florissant, Colorado. — Plates XI.-XV. — 



Issued December 10, 1898 161 



10. Hermann von Schrenk. — On the mode of dissemina- 

 tion of Usnea barbata. — Plate XVI. — Issued Decem- 

 ber 17, 1898 189 



