Bleeding nose of this test rat indicates Warfarin poisoning. 



Photo by John H. Vondell. 



from the Control Service, the farmer 

 inspected the pasture carefully and 

 found a package containing some 

 Paris green near a woodchuck hole. 

 Apparently someone had thrown 

 the package into the hole to dispose 

 of it and perhaps had covered it 

 with dirt. Some time later Mr. 

 Chuck dug himself out again and 

 left the package accessible to the 

 cows. 



This illustrates the point that 

 most poisoning cases are the result 

 of someone's carelessness in han- 

 dling or disposing of poisonous ma- 

 terials. The instances of poisoning 



from ashes containing supposedly 

 burned toxic materials are many, 

 because inorganic poisons are not 

 destroyed by fire. 



Both cases describe the circum- 

 stances under which the Control 

 Service undertakes analytical work 

 on submitted samples. In the first 

 case, responsibility for the poisoning 

 was established; in the second, 

 other animals were saved because 

 of the analysis report. No work is 

 done in isolated cases of poisoning 

 of single pets or other animals 

 when such work will serve only to 

 satisfy the owner's curiosity re- 

 garding the cause of death. 



(continued from page 9) 



Cultivation Still Necessary 



Even though weeds may be elimi- 

 nated by chemicals, it is too soon 

 to think about discarding the cul- 

 tivator because experiments have 

 shown that the soil surface must be 

 kept broken up at critical periods 

 during the growing season to pro- 

 vide for soil aeration. 



Although some of these methods 

 are relatively simple, directions 



must be followed closely. Chemi- 

 cal weeding is new, and even under 

 the best conditions some hand- 

 weeding and cultivation may be 

 necessary, but not so often as 

 formerly. Chemicals are not equal- 

 ly effective in killing weeds un- 

 der all conditions, but where direc- 

 tions are followed, these methods 

 are less costly and faster than culti- 

 vation alone. 



15 



