314 ZOOLOGY. 



and even in individuals of the same race of mankind. This 

 is seen in t'lie difference of the facial angle. This is ob- 

 tained by drawing a line from tlie occipital condyle along 

 the floor of the nostrils, and intersecting it by a second, 

 touching the most prominent i)arts of the forehead and 

 upper jaw; the angle they make is an index of the cranial 

 capacity, and of the degree of intelligence of the individual. 

 The facial angle in the reptiles is very slight, as it is in the 

 birds; in the dog it is 20°, in the gorilla 40°, in the Austra- 

 lian 85°, in the civilized Caucasian it averages 95°, while 

 the Greek sculptors adopted an ideal angle of 100° (Owen*). 

 When the lower part of the face protrudes, as in the negro, 

 the face is said to be prognathous (Fig. 334); where the 

 facial angle is Ijigh, and the face straight, as in the more 

 intellectual forms, the cranium is said to bo orthognathous. 

 Those skulls whicli are high and narrow^ i.e., with the 

 longer diameter to the shorter, as 100 to 65, are said to be 

 doUcJwcephalic, while those with the diameters as 100 to 85 

 are called brachyce2)halic, but these distinctions have been 

 found to be quite arbitrary. 



The classification of the human races is in as an unsatis- 

 factory state as that of tlie domestic animals. Naturalists 

 are now agreed that there is but one species of man. Blu- 

 menbach, from the shape of the skull and the color of the 

 skin, divided mankind into thi'ee varieties, the white or 

 Caucasian, the brown or Mongolian, and the black or Ethi- 

 opian, considering the American variety as connecting the 

 Caucasian and Mongolian, and the Malayan as intermedi- 

 ate between the Caucasian and Ethiopian. Hamilton 

 Smith divided man into three varieties, Caucasian, ]\[on- 

 golian, and Tropical; Latham, also, into three, Japetidffi, 



* Pagenstecher states that the facial augle iu the Caucasiau Euro- 

 pean is 80°-85°, and evea over 90°; in the Mongolians 75°-80°; in 

 negroes 70°-75°; iu the tribe of Makoias in South Africa 64°; in the 

 tribe of Tiklti-Tilski, or Akka negroes, the dwarfs described by 

 •ScUweinfurth, only 60°. — Allgenieiuu Zoologie, i. , p. 250. 



