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as before stated, our insect is a poor juniper. Tlie machines 

 must be kept in motion while there are insects in them so as 

 to prevent their jumping out. 



Trapping. — By arranging variously constructed traps in 

 front of marching mangas large numbers of the insects can 

 thus be secured. Under this heading will naturally fall all kinds 

 of fences, trenches, pits and other barriers that at times are 

 used for diverting and concentrating the insects. 



A very neat contrivance for this purpose was used on the 

 estancia of Mr. Joseph G. Greenwood at Cañada de Gomez in 

 the province of Santa-Fé during the past spring. It consisted 

 ofa box made of boards and tin from the hind end of which 

 branched wings to concentrate the insects and direct them 

 forwards. The box was set at an incline with the front end 

 resting over a barrel or box to hold the locusts that might be 

 trapped. The device for securing the insects consisted ofa pane 

 of glass set in front of a hole in the bottom of the inclined, 

 narrow box. Coming to the hole the locusts naturally tried to 

 jump across and on striking the glass fell into the receptacle 

 below. 



Fences made of sheets of zinc or tin a foot or fourteen inches 

 in height, of foot-wide boards with narrow strips of tin on top, 

 smooth strips of mortar or tin on walls, trenches with perpen- 

 dicular or under-sloping sides and a narrow piece of projecting 

 tin above, as well as others, can be used in directing the insects 

 into pits or other places of confinement. When coupled with 

 driving these really form a very important feature in the des- 

 truction of our locust in the saltona state. 



Poisoning. — Under this heading can be included the various 

 applications of poison, as bran and arsenic; arsenic and water 

 sprayed upon the foliage of weeds and other useless plants; the 

 kerosene, creosote and similar ' contact " poisons; and the sup- 

 plying of food-plants which ai-e poisonous to the insect. 



Under ordinary circumstances these true poisons are not to 

 be recommended, since with the most of such remedies there 

 must always be coupled more or less danger both to the opera- 

 tor and to domestic and wild animals not intended to be des- 

 troyed. The bran and arsenic remedy that has been so highly 

 recommended both in Europe and North America, while very 

 effective, is very dangerous to handle wiiere there are domestic 

 animals of many sorts. As far as most dogs are concerned 

 there would be but little difference; but all kinds of fowls and 



