A METHOD FOR MAKING METHYL VIOLET. CREIGHTON. 61 



vat and in the filter is added to the first vat, where it is again 

 treated with sodium sulphate with the next melt. 



The method that has been described has been operated 

 under the supervision of the writer's assistants, Messrs. K. R. 

 Brown. C. D. Pratt and J. E. Allen, and has given yields of 

 75-85 per cent, of methyl violet. The color of the dye pro- 

 duced had a 2B shade. 



Swarthmore College, 

 Swarthmore, Pa., 

 April 9th, 1919. 



