t)'6^b, ^./^5 



THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Yol. SIV. (I.S.), No. 4. JULY, 1913. 



ON A YIOLET COLOURING-MATTER AND ITS 

 PRODUCTION BY A CERTAIN BACTERIUM. 



W. J. HARTLEY, B.A. 



[communicated by sir WALTER N. HARTLEY, F.E.S.] 



[A uthors alone are responsible for all opinions expressed in their Gommunicaiions-^ 



DUBLIN : 



PUBLISHED BY THE EOYAL DUBLIN SOCIETY, 



LEINSTER HOUSE, DUBLIN. 



WILLIAMS AND NOEGATE, 



14, HENRIETTA STREET, COVENT GARDEN, LONDON, W.C 



1913. 



Price Sixpence. 



