( Continued from par/e 3 of cover, ) 



VOLUME 52. 



1 Thaxteh, Roland. — New or Critical Species of Chitonomyces and Rickia. pp. 1-54. 



June, 1916. 70c. 

 2. Bhidgman, p. W. — The Velocity of Polymorphic Changes between Solids, pp. .'iS-SS. 



July, 1916. 50c. 

 :;. HninaMAN, P. W.— Polymorphism at High Pressures, pp. 89-187. July, 1916. $1.00. 



4. PimicE, GEoncE W. — Theoretical Investigation of the Radiation Characteristics of an 



Antenna, jm. 189-252. October, 1916. $1.00. 

 .'). Walton, A. C. — The 'Refractive Body' and the 'Mitochondria' of Ascari.s canis Werner, 

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



6. Wilson, Edwin B., and Moore, C L. E. — Differential Geometry of Two Dimensional 



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



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



January, 1917. $1.25. 



5. Wheeler, William Morton. — The Mountain Ants of western North America. pp. 



455-569. January, 1917. $1.25. 



9. Briugman, p. W. — -The Electrical Resistance of Metals under Pressure, pp 571-646 



February, 1917. 90c. 



10. Thaxter, Roland. — New Laboulbcniales, chiefly Dipterophilous American 



Species, pp. 047-721. May. 1917. $1,00. 



