No. 4.] 



GYPSY MOTH— APPENDIX. 



369 



Table No. 6. 



Table No. 7 gives the amounts of an average nitrate of 

 lead and the same grade (65 per cent.) of arsenate of soda 

 necessary to make known amounts of arsenate of lead. In 

 this case the nitrate of lead contains 66.5 per cent. PbO 

 and the arsenate of soda 45 per cent. As.^O^ and 3 per cent, 

 chlorine. 



Table No. 7. 



