MarcJi 2gth, igo^.] PROCEEDINGS. xxi 



Mr. D. L. Chapman, M.A., described some experiments on 

 the production of photo-chemically active chlorine. When in 

 this condition, the gas unites with hydrogen, under the influence 

 of Hght, much more readily than when inactive. The two 

 varieties are not essentially distinct, but some presumably 

 molecular difference exists between them to account for this 

 anomalous behaviour, and it had been the aim of Mr. Chapman 

 to discover a means of inducing the property or of causing it to 

 disappear at will. 



Ordinary Meeting, March 29th, 1904. 



Professor W. Boyd Dawkins, D.Sc, F.R.S., President, 

 in the Chair. 



The thanks of the members were voted to the donors of the 

 books upon the table. 



Mr. C. L, Barnes, M.A., quoted a passage from " The 

 Natural History of Selborne," in which a sound as of a loud 

 humming of bees is said to be audible on hot summer days 

 "the whole common through, from the Money Dells to Mr. 

 White's avenue gate," and this although not a single insect is in 

 sight. The phenomenon has been observed in other quarters, 

 notably on the Shoshone Lake, in the Yellowstone Park, where 

 it appears to be peculiarly distinct. Reference was also made to 

 the passage in "The Tempest" (Act. III., sc. ii.), beginning 

 "The isle is full of noises, sounds, and sweet airs, which give 

 delight and hurt not," and to " Comus," where the lady speaks 

 of " airy tongues that syllable men's names On sands and shores 

 and desert wildernesses." 



Mr. R. C. Phillips read a paper (communicated by Mr. 

 C. W. Sutton, M.A.) on "Mean Tones, Equal Tempered 

 Tones, and the Harmonic Tetrachords of Claudius 

 Ptolemy." 



Dr. J. C. Cain, M.Sc, read a paper (communicated by 

 Professor H. B. Dixon, M.A., F.R.S.), entitled, "The 

 Constitution of the Ammonium Compounds." 



