ir CONTENTS. 



Page 

 XII. The Optic Chiasma of Teleosts; : A Study of Inheritance. By 



A. P. Larrabee 215 



XIII. Fluorescence and Magnetic Rotation Spectra of Sodium Vaj)or, 



and their Analysis. By R. W. "Wood 233 



XIV. Results of the Franco- American Expedition to Explore the Atmos- 



phere in the Tropics. By A. L. Rotch 261 



XV. An Approximate Law of Fatigue in the Speeds of Racing Ani- 



7nals. By A. E. Kexnelly 273 



XVI. A n Experimental Study of the Image-Forming Powers of Various 



Types of Eyes. By L. J. Cole 338 



XVII. Expansion and C ompressihility of Ether and of Alcohol in the 



Neighborhood of their Boiling Points. By A. W. Smith . 419 



XVIII. The Hydroids of Bermuda. By E. D. Congdon 461 



XIX. The Spermatogenesis of the Myriapods. (V.) On the Sperma- 

 tocytes of Lithobius. By M. "\V. Blackman 487 



XX. Revision of the Genus Spilanthes. By A. H. Moore . . . 519 



XXI. Concerning the Adiabatic Determination of the Heats of Combus- 

 tion of Organic Substances, especiallij Sugar and Benzol By 

 T, VV. Richards and Messrs. Henderson and Frevert 571 



XXII. On the Thomson Effect and the Temperature Coefficient of 

 Thermal Conductivity in Soft Iron between 115" and 204° C. 

 By E. H. Hall and Messrs. Campbell, Serviss, and 

 Churchill 595 



XXIII. An Electric Wax-Cutter for Use in Reconstructions. By E. L. 



Mark 627 



XXIV. Concerning Position Isomerism and Heats of Combustion. By 



L. J. Henderson 637 



XXV. Temperature of Mars. A Determination of the Solar Heat 



Received. By P. Lowell .... 649 



XXVI. The Transmission of Rontgen Rays through Metallic Sheets. By 



J. M. Adams 669 



