ELISHA MITCHELL SCIENTIFIC SOCIETY. 73 



substance is very volatile it is an easy matter to apply the fumes, 

 having for this purpose a large box well made to prevent the escape 

 of the fumes. In this the cigarette boxes could be placed, and also 

 a small open vessel containing the bisulphide of carbon. Where 

 goods are already damaged the assorting which would be necessary 

 to remove the perforated cigarettes, together with the trouble of ap- 

 plying the remedy, might outweigh the advantage to be gained. 



But in the case of recently manufactured goods in which the eggs 

 were deposited at time ui manufacture, if they are stored in closely 

 fitting boxes, the fumes could be applied to each box about 20 days 

 after manufacturing. As the egg hatches in about 11 days after 

 being deposited the larva? would be very small, and constitute no 

 greater impurity in the cigarettes than what must undoubtedly 

 enter from various other sources. As this is a common remedy for 

 grain weevil, an insect ailcting grains which are used for bread stuffs, 

 there can be no danger in its use. Cigarettes have been smoked 

 within ten minutes from the time they were removed from the fumes. 

 While it is perfectly safe to apply this as a remedy when it seems 

 necessary, and other gentlemen who have had practical experience 

 in such matters also recommend it, there are some who do not re- 

 gard it as a pleasant remedy. On the whole, as the precautionary 

 measures must be adopted sooner or later in order to get rid of the 

 pest, it might, perhaps, be as well to rely solely on them. 



PARASITES. 



Therv^ is a small chalcid fly which enters the boxes sometimes and 

 destroys the larvae. These I discovered September 28. They would 

 probably never prove to be of any considerable economic importance 

 owing to the difficulty attending their reaching the host. 



