ON WAVE-LENGTH TABLES OF THE SPECTRA OF THE ELEMENTS. 297 



Uranium — continued. 



Isomeric Naphthalene Derivatives. — Report of the Committee., consisting 

 of Professor W. A. Tilden (Chairman) and Dr. H. E. Arm- 

 strong (Seo-etary). (Drawn up by the Secretary.) 



The investigation of the action of bromine on betanaphthol, referred to in 

 the 1898 Report, has been continued during the past year with the assist- 

 ance of Mr. W. A. Davis. One of the most important points established 

 is that the nature of the product obtained on tribrominating is largely a 

 question of the conditions. In the presence of a solvent (glacial acetic 

 acid) the tribromonaphthol melting at 155° is the chief product ; but if 

 bromine be used alone, and the action take place rapidly at 100°, the 

 isomeric tribromonaphthol (m.p. 159°), described in the 1898 Report, ia 

 principally produced. This result is more particularly of interest on 

 account of the fact that the latter compound contains but one, whilst the 



