﻿jkKSENICALS. 

 Table 18. — Relative toxicity of new arsenates on 5 species of insects, 1920. 



39 



Arsenates and control. 



Percentage of insects dead within— 



3 days. 



6 days. 



Commercial acid lead 

 arsenate 



Laboratory barium 

 arsenate 



Laboratory copper 

 barium arsenate 



Commercial magne- 

 sium arsenate 



Commercial acid lead 

 arsenate (new proc- 

 ess) 



Laboratory aluminum 



arsenate 



Control with food 



91.0 

 22.0 

 61.0 

 91.0 



91.0 



29.9 

 3.2 

 10.0 

 13.8 



32.9 



4.7 

 0.0 



47.6 

 10.9 

 11.7 

 5.2 



21.0 

 11.0 

 9.0 

 4.0 



18.1 

 14.0 

 18.1 



41.5 

 12.2 

 22.0 



100.0 

 68.0 

 98.0 



100.0 



100.0 



95.3 

 68.2 

 67.5 

 85.2 



84.2 

 37.3 

 57.0 

 46.5 



58.0 

 18.0 

 28.0 

 31.0 



82.2 

 75.1 

 83.2 



7.5 

 0.5 



33.6 

 8.5 



83.9 

 53.3 

 66.7 



Arsenates and control. 



Percentage of insects dead within- 



10 days. 



a s- 



Toxicity for — 



Commercial acid lead 

 arsenate 



Laboratory barium 

 arsenate 



Laboratory copper 

 barium arsenate 



Commercial magne- 

 sium arsenate 



Commercial acid lead 

 arsenate (new proc- 

 ess) 



Laboratory aluminum 

 arsenate 



Control with food 



92.0 

 100.0 



0.0 



100.0 

 88.2 

 95.2 



100.0 



99.2 



98.3 

 24.7 



100.0 

 72.1 

 82.7 

 83.8 



100.0 

 99.0 

 100.0 



100.0 

 87.8 

 94.5 



97.0 

 60.7 

 86.3 

 97.0 



97.0 



16.9 



75.1 

 53.2 

 57.6 

 66.3 



73.4 

 61.3 



77.3 

 40.1 

 50.5 

 45.2 



39.5 

 14.5 

 18.5 

 17.5 



66.8 

 62.7 

 67.1 



40.7 



23.1 



71.1 

 46.2 

 56.0 



1 Based on mortalities for third and sixth days only. 



COMPABATIVE AVERAGE TOXICITY. 



Sample 39, 72.2; sample 62, 56.5. 

 Sample 39, 86.0; sample 70, 85.2. 

 Sample39, 76.2; sample 73, 51.0. 



