152 THE GROWTH OF THE BRAIN. 



into their lobes in the manner in which Broca was 

 accustomed to separate them, the average propor- 

 tional weight of these lobes is similar to that found in 

 the individuals taken as a standard ; for the slight 

 deviations which are here noted are not of any sig- 

 nificance. 



The mode of division is shown in Fig. 30. 



FIG. 30. Left hemisphere of a cerebrum divided into lobes 

 according to the method of Broca. f, frontal lobe : 

 0, occipital lobe ; P, T, parieto-temporal lobe. 



TABLE 42. GIVING THE PROPORTIONAL WEIGHT OF THE 

 LOBES (FRONTAL, PARIETAL, OCCIPITAL) OF THE DE- 

 FORMED CEREBRUM, DIVIDED ACCORDING TO THE METHOD 

 OF BROCA, AND COMPARED WITH THE PERCENTAGES FOUND 

 BY BROCA IN NORMAL FRENCH SUBJECTS BETWEEN 70-90 

 YEARS OF AGE. (Ambialet.} 



6 42-8 



Normal average (Broca) 437 



467 

 46-2 



