288 DISEASES OF DOMESTICATED BIRDS 
ing, will cause death when fed to chickens. The rose chafers ap- 
parently contain a toxin affecting the heart. 
Preventive measures should consist in keeping chickens on mowed 
fields and away from grape vines and flowering shrubs during the 
month when rose chafers are prevalent. 
SALICYLIC ACID 
Lethal dose. 30 to 75 grains. 
Toxic dose. 30 grains. 
Non-toxic dose. 15 grains. 
Experiments. (1) June 10, 1918,104.m. Gave fowl 75 grains 
of salicylic acid. 11.30 a.m. Wings dropped. Fowl sleepy. 
Droopy. 12m. Condition growing worse. 1.30 p.m. Bird dead. 
Autopsy notes. Crop filled with oats. No trace of the three gela- 
tin capsules. At least half of the salicylic acid administered re- 
mains in the esophagus. Mucous membrane of mouth, esophagus, 
crop and lower esophagus is white from action of the salicylic acid. 
Protoplasm is apparently coagulated. Not so severe in lower esopha- 
gus and crop as in upper esophagus and mouth. No other lesions ap- 
parent. ; 
(2) June 25, 1918, 10 a.m. Gave fowl 30 grains of salicylic 
acid. 4p.m. Fowl droopy. June 26,9 a.m. Fowl lying on side 
in comatose condition. 2.30 p.m. Fowl died. Autopsy notes. 
Crop filled with food and some white material probably salicylic acid. 
Dependent portion of wall of crop thickened, wrinkled and coagulated, 
white in color. Mucosa of lower esophagus and proventriculus 
whitened. Intestine mildly hemorrhagic throughout its length. Wall 
congested. Liver dark, capsule thickened in one place. Spleen soft. 
Ovary shows B. pullorum infection. 
(8) July 8,2 p.m. Gave fowl 15 grains of salicylic acid. Re- 
sult. No effect was apparent. 
SANTONIN 
Non-toxic dose. 5 to 15 grains. 
Experiments. (1) June 25, 10 a.m. Gave fowl 15 grains of 
santonin. Result. No effect was apparent. 
(2) June 10,10 a.m. Gave fowl 5 grains of santonin. Result. 
No effect was apparent. 
