204 



MENTAL AND PHYSICAL EXERCISE 



capacity of the mind." We ought, not to suppose, 

 however, that every man having a large head is necessa- 

 rily a person of superior intelligence, 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 estimating the volume of the 

 brain in a living person, is to measure the dimensions of 

 the scull. Every other means, even that proposed by 

 Camper, is uncertain. 



635. Dimensions of the Brain. Tlie 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 pre- 

 sent also a variety of appearances, and hence have received 

 different names. 



636. That portion of the brain which fills the upper 

 part of the scull, and extends from the orbit of the eye 

 to the most prominent parts of the hind head, is called the 

 cerebrum, or encephalon. 



Fig. 120. 



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



