MOLECULAR WEIGHT OF IODINE 237 



[811] IODINE IN ETHYL ETHER 



Total average MI = 507*2 10'5 



Theory for I 4 MI = 508. 



It seems very probable, therefore, that iodine in its red so- 

 lutions has a molecular weight corresponding to 1^ whilst in 

 the violet solution in carbon bisulphide there is a less complex 

 aggregation, giving a value between 12 and Is. I may as well 

 remark that the values for p in the ether solutions correspond 

 approximately with the ratio of one iodine molecule in 100 

 molecules of the solutions; in the carbon bisulphide solutions, 

 this ratio varies between 1 : 100 and 1 : 200. Whilst greater 

 dilution might appear more advisable from a theoretical point 

 of view, it offers an apparently insurmountable difficulty in 

 practice. A glance at the formulae used in the calculation 

 shows that the value of e enters three times in such a manner 

 that any error attached to it would be tripled. As e decreases 

 with the concentration, it is evident that a greater dilution 

 than that employed by me will soon bring e to a point where 



