352 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 



cation. The means to be employed in destroying locust-eggs may be 

 considered under the following divisions: 1. Harrowing; 2. Plowing or 

 spading; 3. Irrigation; 4. Tramping; 5. Collecting. 



" There are many questions respecting the manner in which the eggs 

 of this locust are affected under different conditions, which are of 

 intense practical interest, and which are frequently discussed with no 

 definite result being arrived at, and no positive conclusion drawn. 

 Such are, for instance, the influence of temperature, moisture, and dry- 

 ness upon them ; the effects of exposing them to the air, of breaking 

 open the pods, of harrowing or plowing them under at different depths, 

 of tramping upon them. Everything, in short, that may tend to destroy 

 them, or prevent the young locusts hatching, is of vital importance.'^ 



With a view of settling some of these questions, and in the hope of 

 reaching conclusions that might prove valuable, Mr. Kiley carried on, 

 at Saint Louis, during the winter of 1876-'77, a series of experiments, 

 some of which we shall report, in their proper connection, as they were 

 originally recorded. 



By reference to the following meteorological table, the exact temper- 

 ature at any of the dates mentioned may be ascertained : 



Temperature at Saint Louis, Mo., oftcinter of 1876-77. 



1876. 



Max. 



Min. 



Mean. 



1876. 



Max. 



Min. 



Mean. 





41 

 44 

 47 

 47 

 36 

 45 

 47 

 42 

 45 

 51 

 47 

 38 

 45 

 39 

 33 

 27 

 20 

 24 

 29 

 34 

 45 

 47 

 47 

 40 

 11 

 37 

 55 

 60 

 50 

 38 

 45 

 44 

 27 

 22 

 37 

 43 

 43 

 [.7 

 24 

 19 

 21 

 21 

 24 

 26 



30. 

 35 

 40 

 25 

 22 

 31 

 32 

 23 

 31 

 32 

 31 

 30 

 31 

 23 

 27 

 15 



4 



5 

 12 

 24 

 24 

 33 

 31 



3 

 — 5 



9 

 28 

 36 

 38 

 18 

 12 



4 

 13 



2 

 18 

 23 

 23 

 20 

 13 

 11 

 13 

 13 

 15 

 17 



37 

 39 

 44 

 34 

 32 

 38 

 37 

 35 

 36 

 41 

 40 

 34 

 39 

 28 



29 1 

 16 1 

 14 1 

 16 i 

 23 

 30 

 34 

 38 

 39 

 15 

 5 

 31 

 44 

 48 

 42 

 27 

 36 

 12 

 20 

 16 

 28 

 33 

 34 

 26 

 19 

 15 

 18 

 18 

 21 

 21 



December29 



30 



19 

 21 

 34 



24 

 21 

 26 

 42 

 42 

 43 

 35 

 13 

 28 

 35 

 52 

 32 

 27 

 34 

 43 

 23 

 40 

 46 

 50 

 46 

 37 

 37 

 32 

 31 

 48 

 51 

 50 

 57 

 57 

 65 

 66 

 69 

 56 

 48 

 46 

 40 

 49 

 53 

 47 



10 



4 

 17 



13 



8 

 11 



19 



29 



32 



13 



—4 



1 

 21 

 32 

 14 

 10 

 22 

 23 



9 

 20 

 35 

 39 

 21 

 19 

 23 

 10 

 19 

 22 

 32 

 31 

 33 

 38 

 48 

 53 

 50 

 44 

 35 

 3'2 

 28 

 34 

 38 

 36 



14 



16 



15 



17 



31 



24 



18 



19 



20 



1877. 



14 



21 



22 



23 



2 



3 



4 



15 



21 

 33 



24 



5 



36 



25 



6 



37 



26 



7.: 



21 



27 



8 



7 



28 



9 



19 



29 



10 



31 



30 



11 



40 



December l 



2 



12 



13 



19 



22 



3 



4 



14 



31 



15 



33 



5 



6 



16 



18 



n;::::::::: 



18 . o 



35 



7 



8 



9 



10 



11 



12 



42 



19 



45 



20 



22 



21 



32 



22 



26 



23 



21 



13 



24 



26 



14 



15 



25 



36 



26 



39 



10. 



17 



18 



27. 



41 



28 



47 



29 



30 



49 



19 



20 



.57 



31 



59 



21 





59 



22 





49 



23 



3 



4 



37 



24 



39 



25 



5 



33 



26 



6 



41 



27 



7 



46 



28 



8 



42 



