EXPERIMENTS AGAINST CARPET BEETLES. 31 



Effect on larva. — A trunk test against larvae was made, using 

 camphor at the rate of one-half pound to 9 cubic feet. Twenty-five 

 larvae on flannel in a lantern globe were added. Observations 

 showed, at the end of one month, that 72 per cent of the larvae had 

 been killed. In an untreated trunk only 8 per cent were dead in one 

 month. 



Camphor sprinkled over larvae on flannel in open battery jars 

 killed only a small percentage. In tests with the jars sealed, all the 

 larvae were killed in from 15 to 29 days, but none were killed in seven 

 days. Only 15 per cent died in the untreated jars in 29 days. 



Effect on eggs. — In two tests with camphor scattered on flannel 

 containing 10 or more eggs, no larvae were found to have hatched in 

 11 days, while an average of 13 live larvae was found on the un- 

 treated pieces of flannel used as a 'check. 



Camphor, although effective against the various stages of the car- 

 pet beetle, was not as uniformly efficient as was naphthalene. Since 

 camphor kills more slowly and volatilizes much more rapidly than 

 does naphthalene, its use is not recommended when naphthalene is 

 available. 



BED-CEDAR CHEST. 



Killing effect on carpet-beetle adults, larvce, and eggs. — Thirty 

 adults and a large piece of flannel were confined in a red-cedar chest 

 of 10 cubic feet capacity. At the end of 60 days examination showed 

 that all adults were dead and that one live and more than 100 small 

 dead larvae were present. No noticeable injury had been done to the 

 flannel. 



Twenty-five half to full-grown larvae, placed upon flannel, were 

 confined in the chest for 60 days. At the end of that time none were 

 found dead, and the flannel had been slightly eaten. 



Two pieces of flannel, each containing 10 or more eggs, were in- 

 closed in the chest for 23 days. At the end of that time examination 

 showed 14 small dead larvae on each piece of flannel. The flannel 

 was not damaged. Although the cedar chest failed to kill the eggs, 

 the newly hatched larvae died almost immediately. 



The cedar chest readily killed newly hatched larvae, but failed to 

 kill adults before eggs were laid and also did not kill one-half to 

 full-grown larvae. This cedar chest was the same one used in the 

 clothes-moth test. 



CEDAR CHIPS. 



Effect on carpet-beetle adults. — Cedar chips were employed in three 

 cage tests, about 30 adult beetles being used in each. Examination of 

 the three tests 30 days later showed an average of 10 live larvae on 

 the treated flannel and an average of 16 live larvae on the untreated. 



