6 N. H. AGR. EXPERIMENT STATION. [Bulletin 183 



PAGE 



Calves 41 



Calves were confined to plots of grass carrying spray mate- 

 rial directly applied, at concentrations of 3, 6 and 10 

 lbs. of lead arsenate paste to 50 gallons of water 41 



Where the grass was sprayed at 3 lbs. to 50 gallons the 

 calves were pastured on 7 successive plots without 

 serious poisoning. Thej^ failed to gain weight and 

 showed some minor effects 42 



Where calves were pastured on grass sprayed at a concen- 

 tration of 6 lbs. to 50 gallons, definite symptoms of 

 serious poisoning developed. Removed to grass con- 

 taining no poison, the calves recovered fully 44 



Where calves were pastured on grass carrying a concen- 

 tration of 10 lbs. to 50 gallons, serious poisoning devel- 

 oped and one calf died. The other, removed to grass 

 containing no poison, recovered 46 



Sheep 50 



Experiments were carried out in pasturing sheep on sprayed 



grass within pens 50 



Sheep pastured on grass carrying arsenate of lead at a con- 

 centration of 3 lbs. to 50 gallons consumed the grass in 

 10 successive plots without evidence of serious poisoning 52 



When the concentration was increased to 6 lbs. to 50 gallons 

 serious symptoms developed. The sheep consumed 4 

 plots. These sheep removed to grass carrying no 

 poison recovered fully 52 



When the concentration was increased to 10 lbs. to 50 gallons 

 sheep promptly gave evidence of serious poisoning and 

 one of them died. The other removed to grass free 

 from poison recovered fully 53 



Sheep pastured within a pen beneath sprayed trees showed 

 no evidence of serious poisoning when the spray mate- 

 rial was used at a concentration of 3 lbs. to 50 gallons or 

 6 lbs. to 50 gallons, even tho large amounts of spray 

 were applied to the trees 53 



Sheep confined to a pen beneath a tree heavily sprayed at a 

 concentration of 10 lbs. to 50 gallons developed defi- 

 nite symptoms, but recovered 55 



