ERADICATION OF STOMACH WORMS 301 



(salts, powders, and liquids) which many farmers evidently believe 

 help in keeping the worm under control. 



(1) Gasoline. Of the drenches, gasoline is the one most com- 

 monly used by flock-owners in the United States. It should be given 

 on three successive mornings after the animals have been kept away 

 from all food and drink for 16 hours, and after the dose is given 

 they should be fasted for two or three hours more. Each dose 

 should be measured separately and given in milk, linseed oil, or 

 flaxseed tea. Whole sweet milk, about five ounces with each dose 

 for both sheep and lambs is the medium most frequently employed. 

 One-fourth ounce of gasoline for lambs and one-half ounce for sheep 

 are the sizes of doses most frequently advised. The writer, how- 

 ever, after considerable experience, has adopted larger doses because 

 they seem more effective. Lambs at weaning time are given one- 

 fourth ounce on the first morning, one-half ounce (one tablespoon- 

 i'ul) on the second, and three-fourths ounce on the third. Sheep 

 are given one-half., three-fourths, and one ounce, respectively, on 

 succeeding mornings. Just before drenching, the gasoline and milk 

 or other medium should be shaken vigorously in order to have the 

 gasoline mixed with the medium while the drench is being swal- 

 lowed. It is said that gasoline should never be given with water. 



(2) Coal-tar Creosote. Coal-tar creosote solution is made by 

 shaking together one ounce of coal-tar creosote and ninety-nine 

 ounces of water. The doses of this one per cent mixture recom- 

 mended by Stiles are as follows : Lambs 4 to 12 months old, 2 to 4 

 ounces ; sheep, 3 to 5 ounces. Coal-tar creosote, so-called, seems to 

 vary considerably in composition and this has been a serious 

 objection to its use. 



(3) Copper Sulfate. Copper sulfate solution is prepared by 

 dissolving one pound of pure copper sulfate crystals finely pow- 

 dered in 9% U. S. gallons of warm water. It is better to dis- 

 solve the crystals in a gallon of boiling water and then add cold 

 water and mix thoroughly. The dose for a three-months-old lamb 

 is % ounce; for a six-months-old lamb, iy 2 ounces; a yearling 2y 2 

 to 3 ounces, and an old sheep 3% ounces. As with gasoline, the 

 animals should be deprived of all feed and water prior to the 

 drenching, if either coal-tar creosote or copper sulfate is given, and 

 those treated with the latter should not have water for from 12 to 24 

 hours after dosing. But unlike gasoline, neither of these remedies 

 must be given on three successive days. 



