June, 1917.] ARSENICAL RESIDUES AFTER SPRAYING. 57 



served early. If an animal can gain access to food to which no 

 arsenate of lead has been applied it is apt to hunt it up and let 

 the sprayed forage alone. A lankness or gauntness of body 

 becomes evident. Diarrhea soon begins and as the poisoning 

 progresses this symptom grows pronounced. The animal be- 

 comes languid or listless. There is rarely any tendency toward 

 excitation or nervousness. Rather the senses seem to be dulled 

 with the possible exception of a tendency in some individuals to 

 avoid light. 



As acute poisoning approaches there is more or less paralysis 

 of the legs, especially of the hind extremities. The animal stag- 

 gers on trying to walk. The paralysis soon grows more pro- 

 nounced, and ability to stand is lost. Respiration becomes more 

 rapid. There is frothing at the mouth. The muscles twitch. 

 The body is apt to bloat. There are convulsive tremors, and 

 sometimes genuine convulsions. With the approach of death 

 breathing becomes spasmodic. Frothing and bloating are evi- 

 dent. The animal usually dies with the hind legs drawn back- 

 ward and the muscles tense. 



The symptoms of chronic and of acute poisoning are well 

 stated by Paige (13), from whom the following is quoted: 



"Chronic Poisoning. — Loss of appetite, refusal of water, pur- 

 gation, with feces liquid and nearly black in color, containing 

 an abundance of mucus and blood, the latter either disintegrated 

 or in clots, suppression of urine, progressive paraplegia, emacia- 

 tion, with hair harsh and rough. There appears to be but little 

 disturbance of the temperature functions, the maximum reading 

 obtained being only 103.2°F. The pulse becomes somewhat 

 accelerated and of a thready character, but is not sufficiently 

 altered to constitute an important sympton. There is dullness 

 of the eye and general indications of depression when the symp- 

 toms enumerated above are most in evidence, but with the ehmi- 

 nation of the poison from the system there is a gradual return of 

 the normal body functions, as indicated by a cessation of purga- 

 tion and a return of the appetite. 



"Acute Poisoning. — Attack sudden, characterized by shiver- 

 ing, refusal of food and water, back arched, skin dry and harsh, 

 hair erect, abdominal pain, slight elevation of temperature, 

 pulse thready and increased to 55 to 60 beats per minute, respira- 

 tion accelerated and difficult. Following these symptoms in 



