41(3 THE GYPSY MOTH. 



was dropped upon some egg-olusters, entirely destroying 

 the eggs. 



Pyroligenous Acid. — Februaiy 10. Eight egg-clusters 

 were moistened with pyroligenous acid, but it would not 

 penetrate the chisters. 



Spruce Glim. — Twenty per cent, of spruce gum, thirty- 

 five per cent, of rosin, thirty-five per cent, of cotton-seed 

 oil, five per cent, of turpentine and five per cent, of pine 

 tar were melted and mixed together, and some egg-clusters 

 saturated with the sohition. Xone of the eggs hatched. 



Sulphur Di-oxide. — January 25. Five egg-chisters 

 were placed in a tight box and submitted for ten minutes to 

 the fumes of burning sulphur. March 24, about three-fifths 

 of the eggs had hatched. January 25. Five egg-clusters, 

 placed in a tight wooden box, were submitted for twenty 

 minutes to the fumes of burning sulphur. March 24, nearly 

 all of the eggs had hatched. 



Turpentine. — A quantity of turpentine was poured on 

 five egg-clusters. It readily penetrated, but apparently did 

 not afi'ect the eggs, as nearly all of them hatched. 



During the month of October, 1893, IMr. C. W. Minott 

 experimented in the field with a number of mixtures having 

 creosote oil as a basis. All of these mixtures were efiective 

 in destroying the eggs of the gj'psy moth. The lowest per 

 cent, of creosote oil used was in a mixture composed of 

 eighty per cent, of turpentine and twenty per cent, of creo- 

 sote oil. Even when diluted to this degree, it was found to 

 be efi"ective. 



The following experiments on the eggs of the g^'psy moth 

 were conducted by Mr. Kirldand, in 1895 : — 



Kerosene. — January- 5. Twelve egg-clusters were treated 

 with kerosene oil ; these hatched April 20. April 25. Five 

 egg-clusters treated with kerosene oil ; hatched May 1. 



Turpentine. — January 5. Ten egg-clusters treated with 

 turpentine ; hatched April 18. 



Kerosene and Turjjentine. — May 2. Egg-clusters which 

 had commenced hatching were soaked in a mixture com- 

 posed of equal parts of kerosene and turpentine. May 6. 



