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



The results are summarized in Table No. 13. A detailed 

 discussion follows: 



In plot No. 1 the grass was sprayed with 2 gallons of spray- 

 material containing 1 oz. of dry arsenate of lead or approximately 

 material made up at the rate of 3 lbs. of arsenate of lead paste 

 to 50 gallons of water. Two sheep were placed in this plot. 

 They were maintained on this diet for 45 days. In this time 

 they consumed the grass in 10 sprayed plots. Usually they re- 

 quired about 4 days to eat up the grass in a plot. 



The symptoms exhibited by the sheep were comparatively 

 slight. In the beginning they would drink but little water. 

 This characteristic prevailed more or less thruout the test- 

 Their bodies were a little lank, and once, about the middle of 

 the test, their heads drooped and for a day or two they seemed 

 sluggish. By the last two weeks of the test even these slight 

 symptoms were lacking. The animals ate well and otherwise 

 appeared normal. At no time did they exhibit symptoms indi- 

 cating acute poisoning. 



After the last plot these sheep were removed to a stock pen, 

 Avhere no spray material had been applied and were kept under 

 observation for 17 days longer. Their condition remained 

 normal. 



In the second lot the grass was sprayed with 2 gallons of water 

 containing 2 oz, of dry arsenate of lead or the equivalent of 

 material at the rate of 6 lbs. of arsenate of lead paste to 50 

 gallons. 



The two sheep placed in this plot showed definite symptoms. 

 Beginning with the second day evidence of poisoning occurred. 

 At the end of 4 days they had consumed all the grass in this 

 plot and were transferred, on the fifth day, to a new plot that 

 had been sprayed as before. Here they apparently recovered 

 from the earh^ symptoms and by the time they had eaten all of 

 the grass in the second plot they seemed normal. Again they 

 were moved to a new sprayed plot. On the third day after being 

 moved they again developed sj^mptoms and one of them gave 

 evidence of slight paralysis of a hind leg. However, they ate up 

 the grass in the third plot and were then transferred to a fourth. 

 Very soon both showed some evidence of paralysis in the hind 

 quarters and other symptoms of poisoning. After 3 days in 

 this plot, one of the sheep was decidedly sick, had clearly marked 



