June, '211 



ford: grasshoppers and bran mash 



283 



The poisoned mash used in experiments, the results of which are 

 shown in Table II, was mixed according to the following formula: 

 White arsenic K lbs.; wheat bran 25 lbs. and black strap molasses 2 

 quarts, no fruit being used. In these two experiments individual re- 

 cords were kept on 19 poisoned hoppers and 19 check (unpoisoned) 

 hoppers, both groups being allowed to feed for the same period of time. 

 The 19 poisoned hoppers ate an average of 0.151 square inches of com 

 leaf each between the time of poisoning and death, while the unpoisoned 

 hoppers ate an average of 1.049 square inches during the same period 

 of time, showing that the tmpoisoned consumed approximately seven 

 times as much food as the poisoned ons. 



The following table shows the difference in the amoimt of com leaf 

 eaten by unpoisoned hoppers and those poisoned with bran mash con- 

 taining crude arsenic, during the same period of time. 



Table III 



Averages 



50 hrs. 



The poison mash used in the experiments, the results of which are 

 showTi in Table III, was mixed according to the following formula: 

 IK lbs. crude arsenic, 25 lbs. wheat bran, and 2 quarts black strap 

 molasses, no fruit being used. In these experiments individual records 

 on 22 poisoned hoppers were kept, together with 22 check (unpoisoned) 

 hoppers. The unpoisoned ones ate an average of 1.525 square inches 

 of com leaf each, while those which were poisoned ate only an aver- 

 age of 0. ] 66 square inches, showing that the unpoisoned hoppers con- 

 sumed approximately nine times as much food as the poisoned ones 

 during the same period of time. 



Averaging the three sets of experiments tabulated above, it is seen 

 that complete and individual records were kept on 80 poisoned and 

 74 impoisoned hoppers. The poisoned ones ate an average of 0.122 

 square inches of com leaf between the time of poisoning and death, 

 while those that were not poisoned ate an average of 1.175 square 

 inches during the same length of time. Thus the unpoisoned hop- 

 pers ate 9.6 times as much food as those which were poisoned. 



Taking up the question of the length of time required to kill by the 

 three poisons, we find from the data set forth in the three tables above, 

 the following interesting facts. The 29 hoppers poisoned by bran 



