158 FUMIGATION METHODS 



have done for me and to tell you that the experiment 

 was a grand success." 



A careful examination of the material sent showed 

 seven species of dead insects, as follows: (i) Flour 

 moth, Ephestia kuehniella, adults and larvae; (2) 

 bolting-cloth beetle, Tenebroides mauritanicus, adults; 



(3) American meal worm, Tenebrio molitor, adults; 



(4) flour weevil, Tribolium confusum, adult and 

 larvae; (5) black carpet beetle, Attagenus piceus, 

 adult; (6) a lady beetle, and (7) a hemipterous insect. 

 The latter two were, no doubt, feeding upon some soft- 

 bodied creatures, as they are both predaceous. This 

 web, flour, dust, and insects was placed in a breeding- 

 cage and was under daily observation for three weeks 

 and no life made its appearance. When the package 

 was received one living specimen of the flour weevil, 

 Tribolium confusum, was found. It was, no doubt, a 

 straggler from some crack where the death atmosphere 

 did not reach. 



From recent results we are convinced that this gas 

 is one of the most powerful and penetrating materials 

 ever used in a mill or other buildings for the 

 destruction of vermin. It diffuses so readily that it 

 will permeate all parts of a mill or enclosure in a few 

 minutes. It is a deadly poison if inhaled by a human 

 being, it is true, but there is no necessity of one 

 breathing the fumes if the proper precautions are 

 taken. The writer is satisfied that by its use many 

 a miller can retain possession of his mill who would 

 otherwise be obliged to give it up and acknowledge, in 

 the "struggle for existence," it is the '' survival of 

 the fittest ' ' that wins out. It is humiliating, indeed, 



