CONTENTS. 



Pagb 

 I. (I.) Tico New Methods of Avoiding Error in Calorimetry. By 

 T. W. Richards. (II.) The Constancy of Residts Obtained 

 by One of the New Methods. By T. W. Richards and G. S. 

 Forbes. (HI-) The Comparison of the Two Methods, and the 

 Exact Estimation of Adiabatic Rise of Temperature. By T. W. 

 Richards and L. J. Henderson 1 



II. Measurements of Various Thermal and Electrical Effects, especially 

 the Thomson Effect, in Soft Iron. By E. H. Hall and 

 Messrs. Churchill, Campbell, and Serviss .... 21 



III. The Scalar Functions of Hypercomplex Numbers. By H. Taber 57 



IV. A Revision of the Atomic Weight of Iodine. Second Paper. By 



G. P. Baxter 71 



V. On the Composition of Petroleum. — By C. F. Mabery. — The 

 Sulphur Compounds and Unsaturated Hydrocarbons in Canadian 

 Petroleum. — By C. F. Mabery and W. O. Qcayle . . 87 



VI. Thermal Expansion of Hydrogen and Carbon Dioxide under Con- 

 stant Pressure. T. W. Richards and K. L. Mark . . . 115 



VII. A Revision of the Genus Zexmenia. By W. W. Jones . . . 141 



VIII. Temporal Clauses in Herodotus. By H. D. Brackett . . . 169 



IX. (I.) Descriptions of Spermatophytes from the Southwestern United 

 States, Mexico, and Central America. By J. M. Greenman ; 

 (II.) Diagnoses and Notes Relating to American Eupatoriece. 

 By B. L. Robinson 233 



X. The Relative Positions of the Arc and Spark Lines of the Spectra 



of Titanium, Zinc, and Iron. By N. A. Kent 279 



XI. Preliminary Diagnoses of New Species of Laboulbeniaceoz — VI. 



By R. Thaxter 301 



