THE LICE 81 



as linseed oil, will kill by asphyxia lice with which it comes in contact. 

 This treatment is more effectual if kerosene be shaken up with the oil 

 in the proportion of one of the former to two of the latter. A mixture of 

 kerosene, sulphur, and lard, equal parts, is also quite useful for this pur- 

 pose. 



These treatments will apply to cattle as well as to horses. Where 

 large numbers of cattle are affected resort must be had to spraying with 

 kerosene emulsion or dipping. For the latter purpose ordinary sheep 

 dip or a lime-and-sulphur preparation may be used. 



The large sucking louse of the hog is found principally inside, behind, 

 and in front of the ears, on the breast, and on the inner side of the el- 

 bows. For this animal the stronger preparations of the insecticides 

 should be used, as creolin five per cent, or kerosene and oil equal parts. 

 The kerosene, sulphur, and lard mixture is quite a suitable one for these 

 animals. It is well also to treat their wallows with a three to five per 

 cent, solution of creoHn. 



For dogs creoUn in two per cent, strength is quite satisfactory. Long- 

 haired dogs, especially if heavily infested, should be clipped before 

 treatment. For small house animals, as toy dogs and cats, pyrethrum 

 powder, appHed to the moistened skin as for fleas, is most suitable. 



Whatever insecticide is used it is well to apply vinegar in conjunction 

 with it. This may be added to the fluid preparations in the proportion of 

 about ten ounces to the quart, or it may be applied separately diluted 

 with twice its quantity of water. The vinegar has a destructive action 

 upon the eggs which may survive the ordinary remedies used to destroy 

 the insects. 



Sodium fluoride, which is recommended in the treatment of lice of 

 poultry, all of which are biting hce, should also be effective for the biting 

 lice of mammals, though experience with it up to the present time is not 

 sufficient to have established its value in such cases. In its application 

 it should be rubbed into the hair over all parts of the body. The treat- 

 ment is only applicable to biting lice. 



All measures used for the eradication of lice, whether in the quarters 

 or upon the bodies of their hosts, should be repeated at least three times 

 at intervals of eight to ten days. This is necessary to destroy the lice 

 which may emerge from remaining eggs. 



