It it also advantageously employed during cold weather at any time 

 of the day, since the young, when- the temperature is low, seek shel- 

 ter under clods, etc." 



Under the third head given above, that of trapping, Dr. Kiley in- 

 cludes ditching, trenching, and the use of pans covered with coal 

 oil, or coal tar. In the first two processes ditches or trenches are dug 

 in favorable situations, into which the young insects are driven. 

 Probably the use of pans covered with coal oil will be as simple 

 and advisable a method, unless we except that of rolling, as can be 

 employed in the district under consideration. Dr. Eiley has de- 

 scribed a small pan well adapted for the purpose, as follows : "A 

 ,good and cheap pan is made of ordinary sheet iron, eight feet long, 

 eleven inches wide at the bottom, and turned up a foot high at the 

 back and an inch high at the front. A runner at each end, ex- 

 tending some distance behind, and a cord extending to each front 

 corner, completes the pan, at a cost of about i^l.50. 



"We have known from seven to ten bushels of young locusts 

 caught with one such pan in an afternoon. It is easily pulled by 

 two boys, and by running several together in a row, one boy to 

 each outer rope, and one to each contiguous pair, the best work is 

 performed with least labor. Longer pans, to be drawn by horses, 

 should have transverse partitions to avoid spilling the liquid ; also 

 more runners. The oil may be used alone, so as to just cover the 

 bottom, or on the surface of water ; and the insects strained through 

 a wire ladle. When the insects are very small, one may economize 

 in kerosene by lining the pan with saturated cloth, but this Ijecomes 

 less efficient afterwards, and frames of cloth saturated with oil do 

 not equal the pans." 



The use of destructive agents, such as London purple, Paris green, 

 and the like, has not been attended with any very great success 

 when applied on a large scale. But for limited areas, doubtless a 

 great many of the locusts may thus be easily destroyed. Dr. Pviley 

 has recently published a description of a mixture which was suc- 

 cessfully employed last year in California. The mixture consists of 

 ^'arsenic, sugar, l)ran, and water, the proportions being one part, by 

 weight, of arsenic, one of sugar, and five of bran, to which is added 

 a certain quantity of water. The arsenic and bran ;ire first mixed 

 together, then the sugar is dissolved in water and added to the bran 

 and arsenic, after which a sufficient quantity of water is added to 

 thoroughly wet the mixture. About a teaspoonful of this mixture is 

 thrown upon the ground at the base of each tree or vine (in gardens 

 and orchards) and left to do its work. The poison works slowly, 

 seldom killing its victim within eight or ten hours after it has been 

 eaten." 



In some situations it might be advisable to harrow the surface 

 thoroughly as early in spring as possible, to expose the eggs to the 

 air and to their numerous insect and other enemies. 



CONCLUSION. 



From the data now (Feb. "io) at hand, it does not seem safe to 

 attempt to foretell to what extent the locusts may prove injurious 



