Ixiv REPORT — 1 880. 



That the Committee, consisting of Professor A. S. Herschel, Professor 

 "W". B. Ayrton, Professor P. M. Duncan, Professor G. A. Labour, Mr. J» 

 T. Dunn, and Professor J. Perry, be reappointed for the purpose of pre- 

 paring a final report on experiments to determine the Thermal Con- 

 ductivities of certain Rocks, showing especially the geological aspects of 

 the investigation ; and that Professor A. S. Herschel be the Secretary. 



That the Committee, consisting of Professor W. E. Ayrton, Dr. O. J. 

 Lodge, Mr. J. B. H. Gordon, and Mr. J. Perry, be reappointed for the 

 purpose of accurately measuring the specific inductive capacity of a good 

 Sprengel Vacuum, and the specific resistance of gases at different pres- 

 sures ; and that Professor "W. E. Ayrton be the Secretary. 



That Sir William Thomson, Professor Roscoe, Dr. J. H. Gladstone, 

 and Dr. Schuster be a Committee for the purpose of collecting informa- 

 tion -with regard to Meteoric Dust, and to consider the question of 

 undertaking regular observations in various localities ; and that Dr. 

 Schuster be the Secretary. 



That the Committee, consisting of Professor G. Forbes, Professor 

 W. G. Adams, and Professor W. B. Ayrton, be reappointed for the pur- 

 pose of improving an instrument for detecting the presence of Fire-damp 

 in Mines ; and that Professor G. Forbes be the Secretary. 



That the Committee, consisting of Captain Abney, Professor W. G. 

 Adams, and Professor G. C. Foster, be reappointed to carry out an in- 

 vestigation for the purpose of fixing a Standard of White Light; and 

 that Captain Abney be the Secretary. 



That the Committee, consisting of Mr. Spottiswoode, Professor G. G. 

 Stokes, Professor Cayley, Professor H. J. S. Smith, Professor Sir William 

 Thomson, Professor Henrici, Lord Rayleigh, and Mr. J. W. L. Glaisher, 

 on Mathematical Notation and Printing be reappointed ; and that Mr. J» 

 W. L. Glaisher be the Secretary. 



That the Committee, consisting of Professor Cayley, Professor F. 

 Fuller, Mr. J. W. L. Glaisher, the Rev. R. Harley, Mr. R. B. Hayward, 

 Professor Henrici, Dr. T. A. Hirst, Mr. C. W. Merrifield, Professor Bar- 

 tholomew Price, Professor H. J. S. Smith, Mr. W. Spottiswoode, Mr. 

 G. Johnstone Stoney, Professor Townsend, Mr. J. M. Wilson, and 

 Dr. Wormell, be reappointed to consider and report upon the subject of 

 Geometrical Teaching, and particularly upon the Syllabuses prepared 

 under the authority of the Association for the Improvement of Geome- 

 trical Teaching ; and that Mr. C. W. Men-ifield be the Secretary. 



That the Committee, consisting of Professor Cayley, Professor G. G. 

 Stokes, Professor H. J. S. Smith, Professor Sir WilHam Thomson, Mr. 

 James Glaisher, and Mr. J. W. L. Glaisher, on Mathematical Tables be 

 reappointed ; and that Mr. J. W. L. Glaisher be the Secretary. 



That Mr. W. M. Hicks be requested to prepare a report upon recent 

 Progress in Hydrodynamics. 



That the Committee, consisting of Professor G. C. Foster, Professor 

 W. G. Adams, Professor R. B. Clifton, Professor Cayley, Professor J. D. 

 Everett, Lord Rayleigh, Professor G. G. Stokes, Professor Balfour 

 Stewart, Mr. Spottiswoode, and Professor P. G. Tait, be reappointed for 

 the purpose of endeavouring to procure Reports on the progress of the 

 chief branches of Mathematics and Physics ; and that Professor G. C. 

 Foster be the Secretary. 



That Professors J. Prestwich, T. M'K. Hughes, W. Boyd Dawkins, and 

 T. G. Bonney, the Rev. H. W. Crosskey, Dr. Deane, and Messrs. C. E. J)& 



