650 



TRE POPULAR SCIENCE MONTHLY. 



minutes, and have ceased to exist in a further period of the same du- 

 ration. 



In Fig. 5 there is shown a view of the portable lethal chamber 

 ready for use. It takes the shape of a closed truck on two wheels, and 

 movable like a truck or barrow. It measures five feet in length, is 

 two feet wide, and two feet six inches high. It moves very easily. 



Fig. 5.— Pobtablb Lethal Chambee. 



and can be managed by one man. It is constructed, like the large 

 lethal chamber, of well-seasoned wood, in double wall, with sawdust 

 filling up the interspace. In Fig. 6 the apparatus is shown in section. 

 There is one large chamber, having a capacity of nine cubic feet. The 

 chamber opens at the top by a strong lid, swung from behind, which. 



Fig. 6.— Section op Portable Lethal Chambeb. 



■when brought down, entirely closes it up. Under this lid there is a 

 frame with an opening in the center, through which baskets or cages 

 of different sizes, and containing the animal or animals, can be let 



