APR 4 1899 



CONTENTS. 



PAGE. 



Table of Contents "* 



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



1. Patrons ^ 



2. Active Members v 



History OF the Academy (Abstract) xiii 



Eecord. 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 ^S 



5. Frank Collins Baker. — Theraolluscan 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 ^he mode of dissemina- 

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

 ber 17, 1898 189 



