534 SPORADIC DISEASES. 



The symptoms were those of nervous derangement, partial 

 paralysis, squinting, contraction of the pupils, fits of convulsions 

 succeeded by coma, loss of motor power, amaurosis, and death. 

 In some cases there will be indigestion, purging, the faeces being 

 white, and consisting of the milk the animal was fed upon, loss 

 of flesh, hardness of the belly, and emaciation. In others the 

 digestion may be good and the body fairly nourished. 



In addition to small tubercular deposits, scattered here and 

 there on the membranes — caseous and calcareous, scrofulous 

 tumours were found in the peritoneum, in the mesenteric glands, 

 and in the pleura. Very probably the condition termed hydro- 

 cephalus, or dropsy of the brain, is due to the development of 

 tubercle during foetal life. 



EXOSTOSES 



Are met with in horned cattle. These consist of enamel-like 

 growths of a globular nature, sometimes convoluted, and attached 

 by a pedicle. They dip, along with the dura mater, into the 

 convolutions of the brain, and seem to be due to ossification of 

 the dura mater. 



Mr. Gamgee reports a tumour having the appearances of an 

 ossified brain, which is in the Milan Museum ; and states 

 that these growths sometimes attain the size of an ox's brain, 

 without inducing any apparent disorder until the animal's 

 sudden death. 



I have seen in the horse tumours having a resemblance to 

 dentine invading the temporal bones, both externally and inter- 

 nally ; and these, like the bony tumours of cattle, have induced 

 no marked symptoms during life. 



HYPERTROPHY AND ATROPHY OF THE BRAIN 



Are conditions unknown in the lower animals. In my work on 

 the Principles and Practice of Veterinary Surgery, page 182, a 

 case is described of apparent hypertrophy of the brain ; but in 

 reality the apparent enlargement was due to development of 

 fibrous tissue in the brain, which of itself was not enlarged. 

 In the case of thickening of the dura mater mentioned at page 

 504, the brain was atrophied by compression owing to the thicken- 

 ing of the dura mater. 



