PROC. ENT. SOC. WASH., VOL. 21, NO. I, JAX., IQIQ 11 



In right pocket, 107 eggs 1-3 days old, hatched, 0%, com- 

 pletely collapsed. 



Untreated check, 103 eggs 1-3 days old, 65 hatched, 63.1%. 



In left pocket, 102 eggs 5-7 days old, hatched, 0%, com- 

 pletely collapsed. 



Untreated check, 91 eggs 57 days old, 48 hatched, 52.7%. 



The results showed that the eggs subjected to the complete 

 process were entirely destroyed. 



Further experiments proved that the heat of the dry tumbler 

 is an essential factor in the process. The first steps in the process 

 can not be counted upon to destroy all eggs. This is clearly 

 shown in the following experiments: 



Experiment 2. Wash and rinse only. 



A shirt containing in the pockets two lots of eggs, A and B, 

 was treated as follows: 



Washed 30 minutes in gasoline-soap-ammonia ; temperature of 18.3 C 



Extracted 3 minutes 



Rinsed !"> minutes in new gasoline at 18.3 C. 



1 Extracted 3 minutes 



The hatching record of these eggs and of their untreated checks 

 is as follows: 



Number of Number Percentage 



eggs. Age. hatched, hatched. Remarks. 



A. M 1 -3 days 1 l.l'.i', Embryo fully 



formed in a 



B 100 3-5 days 1 1% few others 



Check for A 54 1-3 days 43 79 . 6% 



Check for B 100 3-3 days 52 52% 



Experiment 3. Wash and rinse only. 



In another experiment we prolonged the wasli to 45 minutes. 

 One O. D. wool shirt was used with a small load of about ten pounds 

 of goods. The shirt contained the following experimental ma- 

 terial : 



A. In left pocket, 102 eggs, 5-7 days old. 



B. In right pocket, 103 eggs, 1-3 days old. 



16 lice in chiffon sack. 



It was treated as follows : 



Washed 4.~> minutes in clarified gasoline at 18 C. with the addition of 



Vz pint of ammonia and about 2 ounces of dry cleaning soap 

 KxtraeU-d ." minutes. 



Rinsed 1"> minutes in ne\v :-,;iM>line at IS" C. 

 I {\ traded .j minutes. 



