CONTENTS. 



Page 



I. On the Effect of Temperature on the Vicosity of Air. By 



Silas W. Holman 1 



IL Comparison of Alcoliol Thermometers Baudin 8208 and 8209 

 with the Air Thermometer at low Temperatures. By An- 

 thony C. White 4 



III. Researches on the Complex Inorganic Acids. By Wolcott 



GiBBS, M.D 50 



rV. Atmospheric Electricity at High Altitudes. By Alexander 



McAdie, M. a 129 



V. On Substituted Pyromucic Acids. By Henry B. Hill and 



Charles R. Sanger 135 



VI. On the Action of Chromic Superfluoride on Benzoic Acid. By 



C. LoRiNG Jackson and George T. Hartshorn . . 187 



Vn. On the Influence of Magnetic Stress upon the Capacity of an 



Electric Condenser. By A. S. Kimball 193 



VIII. A Thermochemical Analysis of the Reaction bettveen Alum and 



Potassium Hydrate. By A. V. E. Young 201 



IX. Crystallograjyhic Notes. By Oliver W. Huntington . . 222 



X. Telescopic Search for the Trans-Neptunian Planet. By David 



P. Todd, M. A 228 



XI. Colored Media for the Photographic Dark Room. By Wil- 

 liam H. Pickering 244 



