CONTENTS. 



Page 

 I. (I.) Recision of the Genus Suhazia ; (II.) Revision of the Mexican 

 and Central American Species of Trixis, and (III) of Hiera- 

 cium. By B. L. Robinsox and J. M. Greenman. (IV.) 

 Synopsis of the Mexican and Central American Species of A Inus. 

 By M. L. Fp:rnali). (V.) Diagiwses and Synonymy of Mex- 

 ican and Central American Spermatophytes. By J. M. Gkeen- 

 MAN. (VI.) Some new Species of Mexican and Nicaraguan 

 Dicotyledons. By M. L. Feknald 1 



II. Tlie Heredity of Coat Color in Mice. By G. M. Allex ... 59 



III. A New General Theory of Errors. By W. E. Story .... 165 



IV. Sexual Reproduction in the Mucorineae. By A. F. Blakeslee . 203 



V. On the Composition of Petroleum. — (T.) C. F. Mabery and O. R. 

 Palm. — The Hydrocarbons in Ohio Trenton Limestone Petro- 

 leum ; (II.) The Hydrocarbons in Canadian Petroleum with high 

 Boiling Points; (III.) Hydrocarbons in Santa Barbara Crude 

 Oil; (IV.) C. F. ^Iabei:y and O.J. Siepleix. — Separation 

 of Solid Paraffine Hydrocarbons from Petroleum icithout Evapo- 

 ration ; (V.) The Solid Paraffine Hydrocarbons that collect in 

 Oil Wells in Pennsylvania ; (N'l) Composition of Commercial 

 Paraffine; (VII.) Composition of Commercial Vaseline, Cosmo- 

 line, and Similar Products. By C. F. Mabery .... 321 



VI. A Quantitative Determiriation of the Anomalous Dispersion of 

 Sodium Vapor in the Visible and Ultra-Violet Regions. By 

 R. W. Wood 363 



VII. The Electrical Conductivity of very Dilute Hydrochloric and Nitric 



Acid Solutions. By H. M. Goodwin and R. Haskell . . 397 



VIII. .4 Revision of the Atomic Weight of Iodine. By G. P. Baxter . 417 



