194 THE farmer's veterinarian 



lice are found on the body, they must be destroyed 

 by disinfectants and washes. A tonic, consisting 

 of 2 teaspoonfuls of sulphate of iron, i teaspoonful 

 of powdered nux vomica and 4 tablespoonfuls of 

 ground gentian root given each day in the food 

 or as a drench, will be very helpful in toning up the 

 system and in enriching the blood. The most 

 important factor of the treatment, however, is in 

 nutritious, wholesome food. 



HOOF CRACKS.— See Sand Cracks. 



HORN FLY. — A small insect about half as large 

 as the common house flies, and very much like them 

 in appearance. Horn flies swarm about the head 

 and settle near the base of the horn, where they 

 bite and cause much irritation. They also attack 

 cattle on the back and sides and flank. The fly 

 mixtures that are commonly advertised, and ap- 

 plied by means of a hand-spray, are excellent for 

 keeping the pests away. A good home mixture to 

 apply at the base of the horns is made of pine tar, 

 kerosene, and fish oil. Use this in equal parts, and 

 apply with a brush. 



HOVEN.— See Bloating in Cattle. 



HYDROCEPHALUS.— See Water in the Brain. 



HYDROPHOBIA, also called rabies and mad 

 dog, is an infectious disease caused by some invis- 

 ible organism. The disease is transmitted from one 

 animal to another by the bite of an animal which is 

 suffering with the disease or by direct inoculation. 

 It is more common in the dog than any other 

 animal, from the fact that dogs run at large and 

 have a tendency to bite other dogs with which 

 they come in contact while they are suffering with 

 the disease. 



The dog shows two forms, furious and dumb. In 

 the furious form the animal at first seeks dark 



