CONTENTS. 



PAOB 



I. Dimensions of the Fixed Stars^ with especial reference to Binaries 



and Variables of the Algol Type. By Edward C. Pick- 

 ering 1 



II. Appendix to Paper on the Mechanical Equivalent of Heat, con- 



taining the Comparison with Dr. JouWs Thermometer. By 



H. A. Rowland 38 



in. No. XXin. — The Magnetic Moment of Fleitman's Nickel. 



By G. E. Bullard 46 



IV. Researches on the Substituted Benzyl Compounds. Ninth Paper. 



By C. Loring Jackson and J. Fleming White ... 63 



V. Contributions to North American Botany. By Asa Gray. . 78 



VI. Researches on the Complex Inorganic Acids. By Wolcott 



GiBBS, M.D 109 



VII. A Theory of the Constitution of the Sun founded upon Spec- 



troscopic Observations original and other. By Charles S. 

 Hastings 140 



VIII. XIII. — Acoustic Phenomenon noticed in a Crookes^ Tube. By 



Professor Chas. R. Cross 155 



IX. Contributions from the Chemical Laboratory of Harvard College. 



By Henry B. Hill 155 



