894 THE EXTERNAL CONFIGURATION 



merely from the fact of its having lacked the stimuli 

 which ought to have come to it through an all-important 

 sense like that of Sight. This is a distinction important 

 to be borne in mind. 



Some measurements have been made of this veiy un- 

 symmetrical Brain of the celebrated Mathematician (whose 

 mental powers were so great notwithstanding the inequality 

 of its Hemispheres), and they have been placed side by 

 side with figures obtained from other similar measurements 

 of the well-evolved brain of the educated but comparatively 

 obscure Journalist. The weight of this latter brain was 

 56oz., so that it would have taken' a high place if it had 

 been incorporated with the table on p. 370. It will be ob- 

 served that the left, as is frequently the case (see fig. 135), 

 is slightly but distinctly longer than the right Hemisphere. 



Comparative Measurements of Two Brains. 



Anterior extremity of Upper end of Fissure of Upper end of Perpen- 

 Frontal Lobe to upper end of Rolando to upper end of dicular Fi.'sure to pos- 

 Fissure of Rolando. Perpendicular Fissure. terior extremity of Occipi- 



tal Lobe. 

 Inches. Inches. Inches. 



De Morgan 



|r. 5 



i 



^H 



2 



L. 5« 2J 2| 



Journalist ^ -d j-a 02 O-^ 



Tip of Temporal Lobe Lower end of Tip of Temporal Fnd of Fisaiire 



to lower end of Fissure Fissure of Kolando Lobe to end or Fis- of Sylvius to upper 



of Uulando. to upnor end of sure of Sylvius. end of I'erpondi- 



Fissuie of Sylvius. cular Fissure. 



Inches. Inches. Inches. Inches. 



1 1 9i'>- .Si 



^ 8 "8 •^S 



Do Morgan j t? 91. 



Journalist i xj o^ 7 q 



1 3J 



r>7 



Another notable difference often met with in European 

 brains of higher type, serving to separate them from such 

 organs as that of the Hottentot Venus (fig. 133), lies 



