liv REPORT — 1873. 



collected during the last few years by the Committee, so as to show their 

 radiant points. 



That Mr. Glaisher, Col. Strange, Sir W. Thomson, Mr. Brooke, Mr. 

 Walker, Dr. Mann, and M. de ronvielle be a Committee for the jjurpose of 

 investigating the efficacy of Lightning-conductors, giving suggestions for 

 their improvement, and reporting upon any case in which a^buildiug has been 

 injured by lightning, especially where such buUding was professedly protected 

 by a lightning-conductor, and that the sum of .£50 be placed at their dis- 

 posal for the purpose. 



That Professor A. W. Williamson, Sir W. Thomson, Professor Clerk Max- 

 well, Professor G. C. Foster, Mr. Abel, Professor F. Jenkin, Mr. Siemens, 

 and Mr. E. Sabine be reappointed a Committee for the purpose of testing 

 the New Pyrometer of Mr. Siemens, and that the sum of £30 be placed at 

 their disposal for the purpose. 



That the Committee, consisting of Dr. Huggius, Mr. J. N. Lockyer, Dr. 

 Ecynolds, Professor Swan, and Mr. Stoney, on Inverse Wave-lengths be 

 reappointed, and that the sum of ^150 be placed at their disposal. 



That the Committee on the Thermal Conductivity of Metals, consisting of 

 Professor Tait, Professor Tj'^ndaU, and Professor Palfour Stewart, be reap- 

 pointed, and that the sum of £50 be placed at their disposal for the 

 purpose. 



That Pi'ofessor Williamson, Professor Eoscoe, and Professor Frankland 

 be a Committee for the purpose of superintending the Monthly Eecords of the 

 Progress of Chemistry published in the Journal of the Chemical Society, and 

 that the sum of £200 (last year's grant of £100 was not drawn) bo placed at 

 their disposal for the purpose. 

 . That Dr. Gladstone, Dr. C. E. A. Wright, and Mr. Chandler Eoberts be 

 reappointed a Committee for the purpose of investigating the chemical consti- 

 tution and optical proporties of essential oils ; that Mr. Chandler Eoberts be 

 the Secretary, and that the sum of £30 be placed at their disposal for the 

 purpose. 



That Dr. Crum Erown, Mr. Dewar, Dr. Gladstone, Dr. Williamson, Sir 

 W. Thomson, and Professor Tait be a Committee for the purpose of deter- 

 mining the temperatures of incandescent bodies by the refrangibility of the 

 light they emit, and that the sum of £50 be placed at their disposal for the 

 purpose. 



That Dr. Crum Brown, Professor Tait, and Mr. Dewar be a Committee for 

 the purpose of investigating the Electric Tensions of galvanic cells in which 

 the oxides or acids of chlorine or iodine form tlie liquid elements, and tliat 

 the sum of £25 be placed at tlicir disposal for the purpose. 



That Professor Eamsay, Professor Geikie, Professor J. Young, Professor 

 Nicol, Dr. Bryce, Dr. Arthur Mitchell, Professor Hull, Sir E. Griffith, 

 Bart., Dr. King, Professor Harkness, Mr. Prestwich, Mr. Hughes, Eev. 

 H. W. Crosskey, Mr. W. Jolly, Mr. D. Milne Home, and Mr. Pengelly 

 be reappointed a Committee for the purpose of ascertaining the existence in 

 diifcrcnt parts of the United Kingdom of any Erratic Blocks or Boulders, 

 indicating on Maps their position and height above tlie sea, as also of ascer- 

 taining the nature of the rocks composing these blocks, their size, shape, 

 and other particulars of interest, and of endeavouring to prevent the destruc- 

 tion of such blocks as in the opinion of the Committee are worthy of being 

 preserved ; that the Eev. H. W. Crosskey be the Secretary, and that the sum of 

 £10 be placed at their disposal for the purpose. 



That Sir C, Lyell, Bart., Professor Phillips, Sir J. Lubbock, Bart., Mr. 



