OF THE ORANG UTANG. 13 



« Tn Orang = i|inch. : 3 inch. = 1 : 2.40. 



c : d. < In Man = i^inch. : 4^ inch. = 1 : 2.75. 



( In Chimpanzee 1 = 15.5"' : 32-5'" = 0.48 : I. 



!In Orang = 4! inch. : i^inch. = 1 : 0-44. 



In Man = 6-7 inch. : 3-4 inch. = 1 : 0.50, or 1 : 0.42. 



In Chimpanzee 2 = 99 mil. : 43 mil. = 1 : 0-43. 



The following six measurements of height, breadth, and length of 

 the human cerebral hemispheres, are the three maximum and the 

 three minimum measurements given by Huschke, at the ninety- 

 ninth page of his work, already referred to : — 



Maximum height in Chinese = 1551ml. 

 „ breadth in Inca =i73'3„ 



„ length in Croat = 200 ,, 



Minimum in Hindoo Fakir = 124 mil. 

 „ Croat =103 „ 



Inca - 151 „ 



From these measurements it is evident that the variations of 

 height oscillate within narrower limits in the human brain than 

 the variations either of length or breadth. The measurement of 

 height, therefore, would seem to possess greater serial importance 

 than either of the other two measurements. Yet the following 

 measurements will show that it is precisely in this dimension that 

 the brain of the apes stands in the greatest relative inferiority to 

 that of man. 



Length of hemispheres in Orang : length in Man = 4^ inch. : 6-7 inch. = 1 : 1.4 or 1 : 1-64, 



„ „ Chimpanzee: „ = 99 inch. : 6-7 inch. = i : 1-540^:1-79. 



Breadth of „ in Orang: breadth in Man = 3^ inch. 14-7 inch. = 1 : 1-23 or 1:2-15. 



„ „ Chimpanzee: „ =95m. 3 :4~7m. = 1:1. 08 or 1 : 1.88. 



„ „ ,, „ =87 m. 4 : 4-7 m. =i:i.i7ori :2-o6. 



Height of „ in Orang : height in Man * 2} inch. : 5 inch. =1:2-35. 



„ „ Chimpanzee: ,, = 54m. 3 :5 m. =1:2-38. 



= 6"4m. 4 :5 m. =1:2. 



Of all the differences of measurements and their relations as yet 

 adduced, the difference between the relative heights of the human 

 and the simious brains seems the most important. 



Small as the difference in the two measurements of corpora cal- 

 losa may seem, we must yet record that posteriorly to the posterior 

 bourrelet or rounded edge of that body in the orang, the corpora 

 quadrigemina came into view when the brain was removed from the 

 skull. This observation will be seen later to have, when coupled 



1 Schrceder Van der Kolk, citt. Huschke, I.e., p. 82. 



2 Idem, Ibid., p. 1 29. 



3 Ibid. 



4 Gratiolet, ' Meuioire,' p. 54. 



