538 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



essential safety contrivance is a glass cap, an extension of the upper part 

 of the stopper which protects the neck of the cylinder in the manner 



Fig. 79. 



shown, and receives any droplets of fluid that may be sprayed out at 

 the moment of withdrawal of the stopper. 



Sterilization of Glycerin.* — H. Bullock has investigated the resist- 

 ance of spores of Bacillus subtilis to heating in anhydrous fluids such 

 as glycerin, oil, and similar substances. In view of the increasing use 

 of such materials in modern surgery, the practical value of this research 

 is obvious. He comes to the conclusion that in the sterilization of 



* Journ. Hygiene, Cambridge, xiii. (1913) pp. 168-77. 



