582 



Journal of Agricultural Research 



Vol. XII, No. 9 



Kerosene, although having a high boihng point of 150'' to 300° C, 

 allowed 83 percent of the dipped eggs and 100 percent of the sprayed 

 eggs to hatch. 



Table II. — Toxicity of various organic compounds to eggs of different ages when dipped 



for -various periods 



Compound. 



Ether. 



Carbon bisulphid. 



Methyl alcohol. 



Chloroform . 



Carbon tetrachlorid . 



Benzene . 



Toluene . 



Acetic Acid. 



Xylene. 



Ortho-bromtoluene . 



Age. 



Fully developed 



embryos 



Partially developed 

 Freshly laid — . ... 



'Fully developed. . . . 

 Partially developed 

 .Freshly laid 



Fully developed . . . . 

 Partially developed 

 Freshly laid 



'Fully developed ... 

 Partially developed 

 .Freshly laid 



I Fully developed ... 

 Partially developed 

 Freshly laid 



Fully developed. . . 

 Partially developed 

 Freshly laid 



Fully developed. . 

 Partially developed . 

 Freshly laid 



Fully developed. . . 

 Partially developed 

 Freshly laid 



Fully developed 



Partially developed 

 Freshly laid 



Fully developed. . . 

 Partially developed 

 Freshly laid 



Percentage hatching after dippmg for- 



I sec- 

 ond. 



100 

 100 



IOC 



100 

 100 



100 

 100 

 100 



100 

 100 

 100 



100 

 100 

 100 



100 

 100 

 100 



S sec- 

 ond. 



10 sec- 

 onds. 



100 

 IOC 

 ICO 



100 

 100 

 100 



3 

 100 



100 

 100 

 100 



o 

 100 

 100 



100 

 100 



o 

 100 



100 

 100 

 100 



100 

 100 



15 sec- 

 onds. 



100 

 100 



100 

 100 



30 sec- 

 onds. 



o 



100 



100 

 100 



100 



o 



100 



100 

 100 



60 sec- 

 onds 



120 

 sec- 

 onds. 



100 

 100 



5 

 100 

 100 



100 

 100 



100 



100 

 O 



In the experiments it v^as noted that compounds with low boiling 

 points evaporated from the surface of the eggs very quickly, this giving 

 the material very little time to penetrate. On the other hand, com- 

 pounds with high boiling points remained upon the eggs for hours, or 

 even days. In view of this fact, a series of experiments was conducted 

 with the lower boiling-point compounds, in which the eggs were dipped 



