6 



The nine remaining pigs were slaughtered on March 30 and 47 

 thornheads were found. Disregarding the three pigs which died 

 after treatment, the carbon tetrachloride was 9.6 per cent effective 

 against thornheads. 



EXPERIMENT 3 



CARBON TETRACHLORIDE (30 C. C.) AND 15 C. C. OF 1 PER CENT NICOTINE-SULPHATE 



SOLUTION 



Five rough-looking pigs were selected at random at one of the 

 Chicago packing houses. The average live weight was 143 pounds. 

 Fecal examination showed all pigs to be positive for ascarids but 

 only one was positive for thornheads. 



On April 14, 1928, each pig was given 30 c. c. of carbon tetra- 

 chloride and 15 c. c. of a 1 per cent nicotine-sulphate solution by 

 stomach tube. Examination of the composite feces April 15 to 

 April 19, inclusive, showed the following for each successive day: 

 4 ascarids; no worms; 1 ascarid and 1 thornhead; no worms. The 

 pigs were killed April 20, six days after treatment. The intestines 

 were carefully examined for parasites, and no thornheads or ascarids 

 were found. The treatment was 100 per cent effective for 

 thornheads and ascarids. 



All five pigs were condemned for icterus. The livers were very 

 pale, showing fatty degeneration, the bile was thick in the gall 

 bladder, and there was a very marked yellow appearance of the fat 

 throughout the carcasses. Cut and stained sections showed fatty 

 degeneration of liver cells with a central necrosis of the lobules of 

 the liver. 



EXPERIMENT 4 



ETHEREAL EXTRACT OF MALE FERN 



Twelve pigs from the South, with an average weight of 65 pounds, 

 were used. 



These pigs were held without feed for 36 hours, and on April 23, 

 1923, each of the 12 was given 4 c. c. of ethereal extract of male 

 fern in hard gelatine capsules, followed by 30 c. c. of castor oil. 

 Fecal examinations from April 23 to April 30, inclusive, showed 

 no worms passed. In the meantime two pigs died of cholera. 



On April 30 the 10 remaining pigs were killed, and 19 thornheads 

 and 38 ascarids were found upon post-mortem examination. Male 

 fern in this test was of no value for the removal of thornheads or 

 ascarids. 



EXPERIMENT 5 



TETRACHLORETHYLENE AND MAGNESIUM SULPHATE 



Nineteen pigs from the Southwest were used in this experiment. 

 One of the nineteen pigs was killed, and 63 thornheads and several 

 ascarids were found in the small intestine. 



On November 15, 1927, one lot of six pigs was dosed with tetra- 

 chlorethylene (C 2 C1 4 ) and magnesium sulphate as follows: Two 

 pigs were each given 2 No. 11 capsules each filled with dry mag- 

 nesium sulphate to which was added 5 c. c. of tetrachlorethylene. 

 Four pigs were each given 4 such capsules. A balling gun was 

 used for dosing. Composite feces were examined after dosing. 



