6 CONTENTS. 



General considerations — Continued. Page. 



Simple method of removine; acid from drums and carboys 53 



The protection of cyanid 55 



Hydrocyanic-acid gas in drimis 55 



The marking of tents 55 



A device for covering fumigation generators 56 



An improved system of fumigation 58 



Supply cart 59 



Procedure 61 



Advantages under this system 63 



Dosage schedule 64 



The improved system in use 67 



Fumigation simplified 68 



Index 69 



