160 VETERINARY MEDICINE AND SURGERY. 



ing as suddenly as they come. They are unequal in size, some like hemp- 

 seed, others as large as beans, and flattened upon their surface. 



The peculiarity of this form of eruption is its suddenness. The 

 lumps appear upon all parts of the body in the course of a few minutes. 

 It is caused by some disorder of the digestive apparatus, and is some- 

 times preceded by colic and diarrhoea. 



A sudden change of diet will frequently produce it, and it is not at 

 all uncommon when horses are first fed on grass. It is supposed that 

 poisonous herbs, a draught of cold water when the animal is heated, 

 sudden exposure to cold and damp, and calculi or worms in the intes- 

 tines, are causes of it. 



Treatment. — As a rule, this is a very simple matter, a mild purga- 

 tive being all that is necessary. Give a ball of: 



Powdered aloes 3 vi. 



Ginger 3 ij* 



Linseed meal, 



Molasses aa sufficient. 



Should there be much itchiness — the animal rubbing itself — the skin 

 must be bathed with warm water, dressed with the acetate of lead lo- 

 tion, recommended for erythema, and low diet prescribed for a few days. 



SCABIES. 



Synonyms. — Mange; Itch; Scab. 



Etiology. — This disease depends upon the presence of a parasitic 

 insect (Fig. 75), which is so small that it can be seen with the naked 

 eye only by the most careful scrutiny. The attacks of this animalcule 

 cause irritation and itching of the skin, and, as a result, the hair falls 

 off in patches. 



Mange is a sure sign of neglect and dirt, or of injudicious feeding, or 

 of bad management of some sort. 



While mango is said to be non-contagious among healthy and well- 

 groomed horses, it is, nevertheless, proper to isolate any horse affected 

 with mange, and not use the same brush and comb as on other animals. 



Symptoms. — Mange usually commences at the roots of the hair of 



