108 



PHYSIOLOGY AND TEMPERANCE. 



correct indication of the mental capacity. The shape of 

 the head affords no guide to the character or mental endow- 

 ments, as it may be the result of external pressure. But 

 when the front and top parts of the head that is, that 

 portion in front of the ears are deep, high and broad, it 

 is evidence of a large cerebrum, and generally indicative 

 of a high degree of brain power. The skull is not of the 



same thickness in all 

 persons. Over the 

 eye-brows there is a 

 space between the 

 two tables of bone. 

 The extent and depth 

 of this cavity cannot 

 be determined by out- 

 ward observation. A 

 prominent forehead 

 is often due to a 

 large frontal space. 



The gray matter 

 covers the white por- 

 tion, and is next to 

 the bone; but it is 

 not spread out on 

 an even surface, nor 

 does it present on 

 its outside a uniform 

 surface. There are a number of rounded edges, called con- 

 volutions, separated by deep furrows. These furrows are 

 merely spaces formed by the convolutions dipping down and 

 returning back in a sort of a fold, just as a seamstress would 

 make a ruffle. These folds vary in depth in different parts 

 of the brain and in different persons. The gray matter not 

 only covers the surface of the convolutions, but dips down 



Fio. 34. Upper surface of the Brain, showing the 

 convolutions and its double structure. 



