8 MISC. PUBLICATION 7 9, U. S. DEPT. OF AGRICULTURE 



No. 43, 64 thornheads. Pig No. 41 passed 1 thornhead and had 2 

 on post-mortem examination; the nicotine sulphate in this case was 

 33.3 per cent effective. Pig No. 43 passed 3 thornheads and had 64 

 on post-mortem examination; the drug was only about 4.5 per cent 

 effective against thornheads. Pig No. 41 passed 1 ascarid and had 

 3 upon post-mortem examination ; the drug was 25 per cent effective 

 against ascarids. 



IODINE SOLUTION 



Four pigs from the same lot were used in an experiment on Decem- 

 ber 28. One pig was given 120 c. c. of a hyperactive iodine solution. 

 This pig passed no worms in the next five days and was killed the 

 sixth day after treatment. Upon post-mortem examination it had 

 13 thornheads. The drug was entirely ineffective against thorn- 

 heads. 



CARBON TETRACHLORIDE (45 C. C.) 



Another pig was given 45 c. c. of carbon tetrachloride with 45 c. c. 

 of castor oil. Fecal examinations for the next five days showed : No 

 worms; 6 ascarids; 9 ascarids; no worms; 2 thornheads; 1 ascarid. 

 Total, 2 thornheads; 16 ascarids. The results of a post-mortem ex- 

 amination on the sixth day after treatment were as follows: No 

 worms; 8 nodules due to thornheads. The treatment was 100 per 

 cent effective against thornheads and ascarids. 



LIQUOR CRESOLIS COMP. U. S. P. 



Another pig was given 4 c. c. of liquor cresolis comp. IT. S. P. 

 in 196 c. c. of water, and died the following night, apparently as a 

 result of the treatment. 



KAMALA EXTRACT 



The fourth pig of the lot was given 60 c. c. of a kamala extract 

 made with 56 grams of kamala in 130 c. c. of carbon tetrachloride. 

 The kamala was left in the carbon tetrachloride for 48 hours and 

 then filtered. The dose was administered with a stomach tube. No 

 worms were passed in the next three days, and the pig was found 

 dead on the fourth da} T . There was no post-mortem examination, 

 but the feces of this pig had shown eggs of thornheads on examina- 

 tion, December 16, and the drug was evidently entirely ineffective 

 in removing thornheads. 



EXPERIMENT 6 



OIL OF CHENOPODIUM 



Seventeen pigs from the Southwest, with an average weight of 

 80.6 pounds, were used. On January 15, 1923, each pig was given 

 1 c. c. of oil of chenopodium in a hard gelatine capsule and 64 c. c. 

 of castor oil by means of a metal dosing syringe. Fecal examina- 

 tions of the manure from the entire group from January 16 to 

 January 19, inclusive, showed no worms passed. The pigs were 

 slaughtered January 19, and large numbers of thornheads were 

 found. Two feet of intestines of one pig were examined and 80 

 thornheads were found in this specimen. Oil of chenopodium in 

 this test was of no value against thornheads. 



