( Continued from paiic ."? of oovfv. ) 



VOLUME 52. 



1. Thaxter, Rolaxd. — New or Critical Species of ChitoncQiyees and Rickia. 



pp. 1-54. June, 1916. 70c. 



2. Bridgman, p. W — The Velocity of Polymorpliic Changes between Solids. 



pp 5.5-88. July, 1916. 50c. 



3. Bridgman, P. W. — Polymorphism at High Pressures, pp. S9-1S7. July, 



1916. Sl.OO. 



4. Pierce, George W. — Theoretical Investigation of the Radiation Charac- 



teristics of an Antenna, pp. 189-252. October, 1916. $1.00. 

 .J. Walton, A. C. — The 'Refractive Body' and the 'Mitochondria' of Ascaris canis 

 Werner, pp. 253-266. 2 pis. October, 1916. 40c. 



