ON THE TRANSFORMATION OF AROMATIC NITROAMINES. 



161 



placement by the hydroxyl group. The four s-(oh]orobromo)-diazo- 

 benzenes and 3-chloro-5-bi'oniodiazotoluene have been ohosen for this 

 purpose. o 



Two facts IiaA'e been the outcome of these experiments. 



When chlorine or bromine occupy similar positions in the benzene 

 ring each is displaced by hydroxyl to an equal extent. No preference 

 appears to be shown to either atom. 



Secondly, it has been found that the halogen is not only displaced 

 from the ortho position v/ith respect to the diazo-group, but also from the 

 para position. The latter replacement, however, takes place to a much 

 smaller extent, not more than 10-20 per cent, of the 

 from the para position. 



halogen coming 



Wave-levgth Tables of the Spectra of the Elements and Compounds.-^ 

 Report of the Committee, consisting of Sir H. E. RoscoE (Chair- 

 man), Dr. Marshall Watts (Secretari/), Sir Norman Lockyer, 

 Professor Sir James Devvar, Professor G. D. Liveing, Professor A, 

 Schuster, Professoi" W. N. Hartley, Professor Wolcott Gibbs, 

 Sir W. DE W. Abney, and Dr. W. E. Adeney. 



Chromium (Spark Spectrum). 



Exner and Haschek, ' Sitzber. kaiseri. Akad. Wissensch. Wien,' cvi. (2), 1897, 

 Adeney, ' Proc. Royal Dublin Soo.,' x. (2), p. 235, 1904. 

 Lohse, ' Publ. Potsdam Obs.,' No. 41. 

 Demarjay, ' Spectres eleetriques,' 1895. 



1906. 



* This was observed by Huggins. 



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