280 



EXAMINATION FOR PHOSPHORUS. 



part of phosphorus, in 100,000 parts of mixture, you 

 may distil over 3 oz. of it which will take at least half 

 an hour without the luminosity ceasing ; Mitscherlich, 

 in one of his experiments, stopped the distillation after 



Fig. 43. 



half an hour, allowed the flask to stand uncorked a 

 fortnight, and then recommenced the distillation : the 

 luminosity was as strong as at first. If the fluid 

 contains substances which prevent the luminosity of 

 phosphorus in general, such as ether, alcohol, or oil 



