30 



THE ORTHOPTERA OF MINNESOTA. 



trating oil as kerosene still another machine has been 

 used to some extent, and in some cases with good results. 

 It is the "Anderson's Coal Oil Contrivance," shown in Fig. 

 10. It is made in the following manner : "Three pieces of 



Fig. 10. — Anderson's Coal Oil Contrivance. After Riley. 



fence board, four feet long and three or four feet apart, 

 serve as sled runners. To the front ends is nailed a fence 

 board fifteen or more feet long. To this, and over the run- 

 ners, three pieces of slat, each four feet long, are attached 

 by a leather hinge; and inch and a half holes through the 

 back end of these slats receive light standards, the lower 

 ends of which are fastened to the back ends of the runners 

 by leather hinges. Peg holes in the upper half of the stand- 

 ards enable you to place the slats at any desirable angle. 

 On the back ends of these slats is nailed a strip fifteen long, 

 parallel with the fence board and three feet from it ; and to 

 these is tacked coarse muslin fifteen feet in length, which 

 forms an apron or movable screen that can be set at any 

 angle. To the front ends of the outside runners a long piece 

 offence wire can be attached, and a mule can be hitched to 

 the wire, much to the disgust of the mule. A boy can pull 

 the light machine, but mules pull longer than boys do." The 

 muslin is kept soaked with kerosene oil, and as the locusts 

 jump against it they come in contact with this death-dealing 

 substance. An oiled locust seems to lose all powder in its long 



