CONTENTS. 



PAGE. 



Table of Contents iii 



List of Officers v 



List of Members. Revised to December 31, 1910. ... vi 



1. Patrons. 



2. Honorary Members. 



3. Active Members. 



Abstract of History xix 



Record. January 1, to December 31, 1910 xxiii 



Papers Published. January 1, to December 31, 1910 : 



1. Francis E. Nipher. — On the Nature of the Elec- 

 tric Discharge. The One-Fluid and the Two- 

 Fluid Theories. — Plates I-X. — Issued Febru- 

 ary 18, 1910 I 



2. Philip Rau. — Observations on the Duration of 

 Life, on Copulation, and on Oviposition in 

 Samia Cecropia Linn. — Issued February 26, 

 1910 21 



3. Frank J. Phillips. — Hail Injury on Forest 



Trees.— Plates XI-X VII. —Issued March 10, 



1910 49 



4. Francis E. Nipher. — On the Nature of the Elec- 



tric Discharge. The One-Fluid and the Two- 

 Fluid Theories.— Plates XVIII-XXV.— Is- 

 sued June 2, 1910 57 



5. John K. Strecker, Jr. — Studies in North Amer- 



ican Batrachology. Notes on the Robber 

 Frog (Lithodytes la trans Cope). — Issued 

 June 14, 1910 73 



6. Adolf Alt. — On the Histology of the Eye of 



Typhlotriton spelaeus from Marble Cave, Mo. 

 —Plates XXVI-XXXIV.— Issued October 12, 

 1910 83 



