80 



THE GYPSY MOTH APPENDIX. 



Outdoor Experiments,* commenced June 



/Sixth /Stage. 



1896. Larvw in 



No burning of foliage appeared in these experiments. 



f Discontinued. 



These experiments with chemically pure arsenite of lead v. 

 arsenate of lead mixture (containing in reality only about 50 

 per cent, chemically pure arsenate of lead) show the relative 

 superiority of the latter. The specific gravity of the arsenite 

 of lead is much greater than that of the arsenate, and for 

 this reason it cannot be so evenly applied to the foliage. 



