54 PARASITICIDES AND ANTIPERIODICS 



iser, can be employed either for solid or liquid impurities, 

 gives off chlorine, and never causes any disagreeable com- 

 binations ; but breaking up instead of preserving organic 

 matters, it diminishes the value of manure with which it is 

 mixed. It is applied as powder, or in solution containing 

 from 2 to 5 per cent., to the walls, wood- work, and floors of 

 the places requiring purification, or sheets soaked in the 

 solution are suspended about the premises. 



PARASITICIDES are killers of parasites, whether animal or 

 vegetable. The group includes germicides, or killers of 

 micro-organisms, and vermicides, which will be subse- 

 quently noticed. They are referred to here as they mainly 

 consist of antiseptics. The many varieties of ringworm pro- 

 duced by fungi are destroyed by antiseptic solutions, by 

 phenol oils, and tincture of iodine. Scab and mange caused 

 by various acari are treated by sulphur ointments, solutions 

 of carbolic acid, creolin, or arsenic, or by tobacco infusion. 

 The strongyli invading the bronchial tubes of young cattle 

 and sheep, and causing hoose or husk, are destroyed by 

 inhalation of diluted sulphurous acid, or chlorine, or by 

 turpentine, chloroform, or terebene, given hit rat radically. 



ANTIPERIODICS are medicines which mitigate or prevent 

 intermittent intensity of the symptoms of certain diseases. 

 Such periodical recrudescence is less marked in the lower 

 animals than in man, but is sometimes observable in the 

 pyrexia of influenza in horses and distemper in dogs. These 

 exacerbations usually occur in specific disorders, and are 

 believed to result from the recurring development of fresh 

 crops of micro-organisms or their products. Cinchona, 

 quinine, iodine, arsenic, alkalies, and salicin, are the most 

 effective antiperiodics. 



REMEDIES ACTING ON THE SURFACE OF 

 THE BODY 



RUBEFACIENTS VESICANTS PUSTULANTS CAUSTICS 

 SETONS THE ACTUAL CAUTEBY ASTRINGENTS DE- 

 MULCENTS EMOLLIENTS DILUENTS 



Irritants, or Counter-irritants, applied to the skin, produce 

 nervous and vascular reaction, and reflexly induce certain 



