INSECTICIDES. 415 



all had hatched. January 25. A mixture of phenol, ten 

 per cent., and alcohol, ninety per cent., was poured upon 

 five egg-clusters, which were blackened and burned. Jan- 

 uary 25. Five egg-clusters were treated with a mixture of 

 phenol, twenty per cent., and water, eighty per cent. This 

 mixture was stirred until it became milky white, then a little 

 was poured upon the egg-clusters, and seriously burned 

 them. January 30. A mixture of phenol, four per cent., 

 and water, ninety-six per cent., was poured upon five egg- 

 clusters. The mixture penetrated only a part of the egg- 

 cluster, and nearly one-half of the eggs hatched. January 

 30. A mixture of phenol, three per cent., and water, 

 ninety-seven per cent., was poured upon five egg-clusters. 

 About nine-tenths of the eggs hatched. February 1. A 

 mixture composed of phenol, fifty per cent., and sulphuric 

 acid, fifty per cent., was dropped upon five egg-clusters. 

 This mixture slowly penetrated the egg-clusters and de- 

 stroyed the eggs. February 2. A mixture containing fifty 

 per cent, alcohol, twenty-five per cent, phenol and twenty- 

 five per cent, of sulphuric acid, was dropped upon five egg- 

 clusters, destroying the eggs. February 26. A mixture 

 of fifty per cent, alcohol, twenty-five per cent, phenol, 

 twenty-five per cent, sulphuric acid, with a little potassic 

 ferricyanide and ferrous chloride, was dropped upon some 

 egg-clusters. The mixture readily penetrated the clusters, 

 turning them dark blue and completely destroying the eggs. 

 February 2. A mixture of alcohol, fifty per cent., phenol, 

 twenty-five per cent., and sulphuric acid, twenty-five per 

 cent., was dropped upon five egg-clusters. It readily pene- 

 trated the clusters, turning them black and completely de- 

 stroying the eggs. February 25. A mixture of alcohol, 

 sixty per cent., phenol, twenty per cent., and sulphuric 

 acid, twenty per cent., was dropped upon some egg-clusters, 

 turning them black and completely destroying the eggs. 

 March 1. A mixture of phenol, fifty per cent., turpentine 

 and nitric acid, fifty per cent., was dropped upon some 

 egg-clusters, entirely destroying the eggs. March 14. A 

 mixture composed of phenol, fifty per cent., turpentine with 

 a small amount of concentrated nitric acid, fifty per cent., 



