MEDICINE 587 



the action of sunlight in augmenting the supply of vitamin A, 

 fat-soluble vitamin, and of her subsequent work on artificial 

 Hght produced by the mercury vapour quartz lamp. A full 

 report of these most important studies is being prepared, but 

 it can now be taken as established that the violet rays of the 

 spectrum exercise a special effect on the human organism, 

 enabling it to maintain health on a greatly decreased quantity 

 of animal fat. It is likewise established that such a commodity 

 as cod-liver oil represents a form of " bottled sunshine." 



The epidemiological experiments on a colony of mice have 

 been continued, and the further fact been recorded that if a 

 large colony be split up into numerous sub-colonies at the 

 moment of the first appearance of an epidemic, this epidemic 

 will be, to some extent, reduced in virulence. It is suggested 

 that poultry-keepers and other farmers of small animals might 

 put this knowledge into practice at once, dividing up their 

 stock into small parcels whenever threatened by disease on an 

 epidemic scale. 



