permanganate solution. The reaction mixture was removed from the 

 flask and evaporated to dryness, proceeding from this point as in the 

 case of erythrosin. These results also are given in Table 3. 



TABLE S. Estimation of iodin in iodoform and in phenyl iodid. 



These determinations have not yet been checked against those 

 obtained by other methods, but pending further work to establish the 

 limits of usefulness of the procedure they are reported as found. The 

 method seems to answer perfectly for the estimation of iodin in 

 erythrosin, either when this color alone is present or in a mixture with 

 other colors or with salts of the other halogens. Attention is called 

 particularly to the results given in Table 1, which shows the appli- 

 cation of the method in inorganic analysis to the estimation of iodin 

 in the presence of chlorids and bromids. The method seems to pos- 

 sess the double advantage of simplicity and accuracy. 



Approved : 



JAMES WILSON, 



Secretary of Agriculture. 

 WASHINGTON, D. C., November 5, 1910. 



Cir. 65 



o 



