18 
TECHNICAL BULLETIN 134, U. S. DEPT. OF AGRICULTURE 
Minimum 
lethal dose 
Mg. per 
kgm. of 
body weight 
1, 250 
150(?) 
150+ 
150+ 
1,000 
1,000 
600 
750 
350+ 
750 
3,000 
2,000 
Month of 
feeding 
1924 
Anril 
1925 
October.. - 
...do - 
...do 
December. 
...do 
...do 
...do 
...do 
1926 
March.... 
June 
August 
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