CONTENTS. 



Page 

 I. Some Considerations regarding Helmholtz's Theory of Con- 

 sonance. By Charles R. Cross and Harry M. Good- 

 win 1 



II. Note on the Dependence of Viscosity on Pressure and Tempera- 

 ture. By Carl Barus 13 



III. What Electricity is : Illustrated by some New Experiments. 



By W. W. Jacques 19 



IV. Further Additions to the North American Species of Laboul- 



beniaceos. By Roland Thaxter 29 



V. On a Theorem of Sylvester's relating to Non-degenerate 



Matrices. By Henry Taber 46 



VI. Researches on the Volatile Hydrocarbons. By C. M. War- 

 ren 56 



VII. Note on a Criticism of the Author s Apparatus for Fractional 



Condensation. By C. M. Warren 89 



VIII. On the Formation of the Anhydrides of Benzoic and Substituted 

 Benzoic Acids. By George D. Moore and Daniel 

 F. O'Regan 93 



IX. Note on the Relative Position of High Temperature Melting 



and Boiling Points. By Carl Barus 100 



X. On Bivalent Carbon. First Paper. By J. U. Nef . . . 102 



