CHAP, in.] HEARING, SMELL, AND TASTE. 569 



lobes were found after death to be absent. Direct experiments on 

 animals however shew that loss of the olfactory lobes entails loss of 

 smell. On the other hand, it is stated that section or injury of the 

 fifth nerve causes a loss of smell though the olfactory nerve remains 

 intact ; but in these cases it has not been shewn that the olfactory 

 membrane remains intact, and it is quite possible that, as in the 

 case of the eye, changes may take place in the nasal membrane as 

 the result of the injury to the fifth nerve, sufficient to prevent its 

 performing its usual functions. 



