208 



MENTAL AND PHYSICAL EXERCISE. 



direct proportion to the capacity of the mind." " We 

 ought not to suppose, however, that every man having 

 a large head is necessarily a person of superior intelli- 

 gence, for there are many causes of an augmentation of 

 the volume of the head beside the size of the brain ; but 

 it is rarely found that a man distinguished by his mental 

 faculties has not a large head. The only way of esti- 

 mating the volume of the brain in a living person, is to 

 measure the dimensions of the skull. Every other 

 means, even that proposed by Camper is uncertain." 



Dimensions of the Brain The whole substance of 

 the brain, and spinal marrow, are continuous, forming 

 but a single piece. But the different parts of this organ 

 are supposed to perform different functions, and they 

 present also a variety of appearances, and hence have 

 received different names. 



That portion of the brain which fills the upper part of 

 the skull and extends from the orbit of the eye, to the 

 most prominent parts of the hind head is called the cere- 

 brum, or encephalon. 



Fig. 120. 



Is there any proportion between the size of the brain and the intellect 1 



