THE NERVOUS SYSTEM. 383 



some seasons than others ; it is also somewhat rare in this 

 country. 



Fost-mortem examination having proved the presence of 

 the parasite, this must not be thrown away carelessly, but 

 destroyed or preserved as a specimen, for it is of interest. 

 Trephining. may be experimentally tried, for in calves the 

 sinuses are very small, and so sometimes a yielding of thb 

 bone over the hydatid may be perceived. With regard to 

 the direction of turning and other interesting physiological 

 deductions from this disease, as seen in the sheep, 

 the 'Journal of Anatomy and Physiology,' 1879-80, may 

 be consulted with benefit. 



The occurrence of bony tumours in the cranium is 

 noticed under the heading " Exostoses.'' It will be 

 remembered that the cases of " ossified brain'' recorded 

 are of this nature. 



We know but little of the derangements of the brain of 

 a less striking nature than those hitherto described which, 

 perhaps, occur in the ox. But we must remember that 

 the conditions of life of this animal are not such as to 

 call for any high exercise of cerebral functions, nor are 

 cattle, as a rule, subjected to such close scrutiny as 

 suffices to detect slight indications of brain disorder. 

 This organ is very liable to disease in association with 

 deranged conditions of the digestive apparatus, and a 

 disease of this kind has been described as Stomach staggers, 

 but really is a case of functional brain disease due to con- 

 gestion. We are familiar with the drowsy sensation 

 which results from a fulness of the stomach ; the same is 

 sometimes exaggerated in cattle, giving rise to Goma, 

 which is denoted by dulness and a torpid condition, with 

 sleepiness and a tendency to fall down, especially when 

 the head is elevated. The respirations are deep and slow, 

 the pulse full and slow, and the pupil dilated. This is 

 the state also induced by narcotic poisons ; it is then 

 termed Narcosis, It must be treated by bleeding, stimu- 

 lants, and a full cathartic dose. 



Delirium is a condition of perverted cerebral functions 

 seen in some diseases, such as encephalitis and some forms 



