THE NEW YORK JOURNAL OF PHARMACY 



15 



air, rapidly assume their original color. 

 Further investigation shows that 

 this yellow coloring matter is not iden- 

 tical with chrysophanic acid. It is 

 most likely identical with Lapachol, 

 which is a derivative of a-Naphtho- 

 chinon, possessing the formula of 

 C15H14O3. 



Sensitive Reaction for Free Bromine. 



If an aqueous solution of rosanilin- 

 bisulphite be brought into contact with 

 bromine water or bromine vapor, a 

 red-purple or violet color or precipitate 

 results. The addition of chloroform 

 intensifies the violet color. This violet 

 colored chloroformic solution of the 

 reaction product, shows two absorp- 

 tion bands, a faint one in the blue, and 

 a more distinct one, in the orange- 

 yellow part of the spectrum. 



The requisite solution of rosanilin- 

 bisulphite is prepared as follows: One 

 liter of an aqueous fuchsin solution, 



I : 100 is brought into reaction with 

 10 ccm. of a solution of sodium bisul- 

 phite, 30=33° Baume, and after a lapse 

 of 5 minutes 20 ccm. of hydrochloric 

 acid, S/G. 1.18 are added. After set- 

 ting aside for a period of about 2 hours 

 the solution is ready for use. 



2 ccm. of this solution are mixed with 

 an equal volume of solution of hydro- 

 gen dioxide (10 vol.), i ccm. of chlor- 

 oform is added, and a sufficient quan- 

 tity of suspected liquid, after which 

 the whole is shaken thoroughly. 



If bromine is present the chloroform 

 assumes a more or less intense violet 

 color. In presence of bromine to the 

 amount of o.oi mg. the solution will 

 still assume an amethyst color. In 

 case of air containing bromine vapors, 

 this is passed through the reagent, 

 when after a time the chloroformic 

 layer will assume the characteristic 

 color. A coloration of the aqueous 

 layer is to be disregarded. 



THE RUSBY DINNER. 



The Eighteenth Annual Dinner of 



the Alumni Association was held at 



the Chemists Club on the evening of 

 December 17th, 1913. 



This dinner was given in honor of 

 Dean Rusby, who celebrates this year 



the Twenty-fifth Anniversary of his 

 connection with the College of Phar- 

 macy, and it was a complete success 

 socially. About ninety-five participants 

 enjoyed the splendid menu served, 

 there was good feeling aplenty and an 

 atmosphere of "homelikeness" pre- 

 vailed throughout the entire evening. 



