DOSAGE REQUIREMENTS. 



49 



Table IX. — Recommended dosage, with 45-miniite exposures — Continued. 



EXPERIMENTS WIIH BELL OR HOOP TENT. 



The bell or hoop tent used in these experiments was one constructed 

 of 6|-ounce drill of the brand most commonly used in California. 

 Owing to the form of the tent the leakage surface is far less in propor- 

 tion to the volume than in the sheet tent. The data concerning the 

 experiments and the recommended dosage based upon the experi- 

 ments with the sheet tent are given in Table X. 



Table X. — Experiments in fumigation with bell-shaped tent of 6\-ounce drill. 



In these experiments a dosage sufficient to destroy all pupge was 

 used in eleven instances. The total amount of cyanid used in the 

 eleven experiments was 78f ounces, whereas the doses recommended 

 in the tables, based upon the experiments with the sheet tents of 

 8-ounce duck, together amounted to 96 ounces. The average of the 

 amounts used in the eleven tests was 7.2 as against 8.7 recommended 



