CHAPTER XVII. 
DISEASES OF THE BRAIN AND NERVOUS SYSTEM 
IN GENERAL. 
1. Inflammation of the Brain and Its Coverings (Phrenitis). 
This is not at all common, but it is sometimes met with. 
Its primary condition is congestion, which is followed by 
inflammation. 
Causes. — Tumors growing in the vicinity of the brain, 
severe injury to the skull with or without fracture, contintied 
exposure to the hot sun are among the causes more fre- 
quently met with. An abscess formed in the brain during an 
Fig. 33. — Symptoms of Inflammation of the Brain. 
attack of distemper or -strangles may cause it. It may be 
added that phrenitis may develop without any cause that 
can be accounted for. 
Symptoms. — A very noticeable dullness is the first symp- 
tom. If standing in a stall the horse rests his head upon the 
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