August 19, 1898.] 



SCIENCE. 



227 



20. The Relation of Direct and Reflected Ob- 

 servations with Meridian Intruments, and the 

 Interpretation of Results. By Professor J. R. 

 Eastman, U. S. Naval Observatory, Washing- 

 ton, D. C. 



21. The Eiiect of Atmospheric Disturbance 

 on Telescopic Definition. By Professor G. 

 W. Hough, Dearborn Observatory, Evanston, 

 111. 



22. The Condition of the Surface of the Planet ' 

 Jupiter. By Professor G. "W. Hough, Dearborn 

 Observatory. 



23. The Observation of Occultation of Stars 

 by the Moon. By Professor G. W. Hough, 

 Dearborn Observatory. 



24. A Class of Functions connected with 

 Kepler's Problem. By Professor Edgar O. 

 Lovett, Princeton University, Princeton, N. J. 



25. On the Aims of the International Society 

 for the Promotion of Quaternions and Allied 

 Branches. By Dr. Alexander Macfarlane, Chat- 

 ham, Ont. 



The following reports on recent progress will 

 be presented : 



1. Report on the Recent Progress in the 

 Dynamics of Solids and Fluids. By Dr. Ernest 

 W. Brown, Christ's College, Cambridge, Pro- 

 fessor of Applied Mathematics, Haverford Col- 

 lege, Pa. 



2. Report on Theory of Invariants : the Chief 

 Contributions of a Decade. By Professor Henry 

 S. White, Northwestern University, Evanston, 

 111. 



3. Report on the Recent Progress in the 

 Mathematical Theory of Electricity and Mag- 

 netism. By Professor Arthur G. Webster, Clark 

 University, Worcester, Mass. 



4. Report on the Modern Group Theory. By 

 Dr. G. A. Miller, Cornell University, Ithaca, 

 N. Y. 



5. Meteorology from a Mathematical and 

 Physical Point of View. By Professor Cleve- 

 land Abbe, Weather Bureau, Washington, D. C. 



SECTION B. — PHYSICS. 



Address of the Vice-President : On the Per- 

 ception of Light and Color. By Professor 

 Frank P. Whitman, Adelbert College, Cleve- 

 land, Ohio. 



1. The Measurement of Thermal Conduc- 



tivity in Iron. By Professor E. H. Hall, Cam- 

 bridge, Mass. 



2. On Energy and Entropy. 



3. Second Report on the Magnetic Survey of 

 Maryland. By Professor L. A. Bauer, Cincin- 

 nati, Ohio. 



4. On the Magnetic Deflection of Diffusely 

 Reflected Cathode Rays. By Professor Ernest 

 Merritt, Ithaca, N. Y. 



5. On the Electrical Properties of the Vapor 

 from the Arc. By Professor Ernest Merritt and 

 O. M. Stewart, Ithaca, N. Y. 



6. The Heat of Fusion of Ice Determined in 

 Electrical Units. By Professor E. Ij. Nichols, 

 Ithaca, N. Y. 



7. The Hysteresis of Iron and Steel at Or- 

 dinary Temperatures and at the Temperature 

 of Solid Carbon Dioxide. By A. H. Thiessen, 

 Ithaca, N. Y. 



8. The Electrical Resistance of Lead Amal- 

 gams at Low Temperatures. By G. W. Gress- 

 man, Ithaca, N. Y. 



9. The Most Efficient Thickness of Trans- 

 former Plate. By F. Bedell, R. M. Klein and 

 T. P. Thompson, Ithaca, N. Y. 



10. The Resistance of Iron Wires for Alter- 

 nating Currents of Ordinary Frequencies. By 

 Professor Ernest Merritt, Ithaca, N. Y. 



11. Photographic Studies of the Electric Arc. 

 By N. H. Brown, Ithaca, N. Y. 



12. Exhibition of Certain Models in Physics 

 and Dynamics. By Professor Carl Barus, 

 Providence, R. I. 



13. Lightning Photographed on Moving 

 Plates. 



14. On the Use of the Electrodynamometer 

 instead of the Telephone in Electrolytic Re- 

 sistance Measurements. By Professor Arthur 

 Kendrick, Terre Haute, Ind. 



15. The Structure of Cyclones and Anti- 

 cyclones. 



16. Temperature and Vapor Gradients in the 

 Atmosphere. By Professor F. H. Bigelow, 

 Washington, D. C. 



17. On the Velocity of Light in a Magnetic 

 Field. By Edward W. Morley, Henry T. 

 Eddy and Dayton C. Miller. 



18. A Study of Standard Meter Scales ruled 

 on Nickel, Silver and Glass. By Professor D. 

 C. Miller, Cleveland, Ohio. 



