( Continued from pnqe 3 of cover. ) 



VOLUME 52. 



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



June, 1916. 70c. 



2. Bbedgman, p. W. — 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. 81.00. 



4. Pierce, George W. — Theoretical Investigation of the Radiation Characteristics of an 



Antenna, pp. 189-252. October, 1916. Sl.OO. 



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



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

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

 . Surfaces in Hyperspace. pp, 267-?68.. November, 1916., 81:50. < ' 



7. Hitchcock, Frank Lauren. — A Classification of Quadratic Vectors, pp. 309-454. 



January, 1917. S1.25. 



8. Wheeler, Willi.\m Morto.n. — The Mountain Auts of western North America, pp. 



455-569. January, 1917. S1.25. 



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



February, 1917. 90c. 



10. Thaxteb, Roland. — New Laboulbeniales, chiefly Dipterophilou^ American Species. 



pp. 647-721. May, 1917. Sl.OO. 



11. Crozier, W. J. — On the Pigmentation of a Polyclad. pp. 723-730. 1 coloreJ plate. 



May, 1917. 40c. 



