C Continued from page 3 of cover. ) 



VOLUME 52. 



1. Thaxter, Roland. — New or Critical Species of Chitonomyces and Rickia. 



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



2. Bridgman, p. ay — The Velocity of Polymorphic Changes between Solids. 



pp 55-88. July, 1916. 50c. 



3. Bridgman, p. W. — Polymorphism at High Pressures, pp. 89-187. 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. 



5. Walton, A. C. — The ' Refractive Body ' and the ' Mitochondria ' of Ascaria canis 



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



C. Wilson, Edt\in B., and Moore, C. L. E. — Differential Geometry of Two Dimen- 

 sional Surfaces in Hyperspace. pp. 267-368. November, 1916. $1.50. 



7. Hitchcock, Frank Lauren. — A Classification of Quadratic Vectors, pp. 369-454. 

 January, 1917. SI. 25. 



