414 



THE GYPSY MOTH. 



trated readily, but did not affect the vitality of the eggs. 

 March 15. Several egg-clusters were treated in the same 

 manner as in the preceding experiment, and about one-tenth 

 of the eggs hatched. 



Pine Tar Mixtures. — February 1. A mixture, com- 

 posed of fifty per cent, of pine tar and fifty per cent, of 

 phenol, was poured upon five egg-clusters. It soaked into 

 the clusters readily, and blackened them, apparently de- 

 stroying the eggs. February 3. A mixture of pine tar, 

 fifty per cent., and turpentine, fifty per cent., was dropped 

 upon five egg-clusters. It penetrated readily, turning the 

 eggs black and apparently destroying them. February 3. 

 A mixture containing equal parts of pine tar, phenol and 

 turpentine was dropped upon five egg-clusters, completely 

 destroying the eggs. A mixture composed of forty per 

 cent, of pine tar, forty per cent, of phenol, twenty per cent, 

 of alcohol, with corrosive sublimate, was dropped upon ten 

 egg-clusters, and, although the eggs did not appear to be 

 destroyed, none hatched. March 6. A mixture of pine 

 tar, fifty per cent., alcohol, forty-five per cent., tannic acid, 

 two and one-half per cent., and ferrous sulphate, two and 

 one-half per cent., was dropped upon a number of egg- 

 clusters, which it readily penetrated, rendering the eggs soft. 

 The object of the last two substances was to give the solu- 

 tion a black color. March 6. A mixture of pine tar, fifty 

 per cent., alcohol, forty-five per cent., and Stafi"ord's ink, 

 five per cent., was dropped upon some egg-clu-sters. It 

 readily joenetrated to the bottom layer, destroying the 



Phenol. — January 21. A small amount of liquid phenol 

 was poured upon an egg-cluster. This burned the eggs to 

 a crisp. January 21. Five egg-clusters were treated for 

 ten minutes with vapors of phenol, one hundred per cent., 

 care being taken that the egg-clusters should be dampened 

 by the vapors. The eggs were badly burned. January 21. 

 Five eofSf-clusters were treated for fifteen minutes in the 

 same manner as in the preceding experiment, except that 

 the vapors were not allowed to wet the egg-clusters. Ap- 

 parently the eggs were not injured, for, by March 24, nearly 



