an angle of 90° obtained by my method agrees with a position of 
the For. magn. parallel to the base-line, i. e. a horizontal position. 
Angle of the For. magn. in full-grown human shulls. 
Papuans: 96°, 99, 99, 99,100,101,103,107,107,108 Av 1019° 
Negroes: 92°, 96,07, 98, 99,100,100.101,103,106, 99V 
Frisians: 86°, 89, 90, 94, 95, 99,100,103,103,103,’ 1’ 96,V 
Zeelandians: 93°, 97, 99,100,101,103,104,105,109,112 ” 102 V 
Javanese: 92^,92,97, 99,100,100,103,103,103,105,’ 99,4°. 
The averages of three of the groups lie comparatively near each 
other, and the existence of a difference between dolichocephalic 
skulls (the first three groups) and brachycephalic cannot be assumed 
on the ground of these figures, although the difference between the 
long dolichocephalic Frisian skulls and the short strongly brachv- 
cephalic Zeelandian skulls is very remarkable. It is also peculiar that 
among the Frisian skulls there were two in which the For. magn 
looked slightly backwards (angles of 86° and 89°) and one where 
it lay exactly horizontal. This was caused by the particularly long 
clivus m these objects. That the degree of development of this part 
of the cranial base in human beings has a great influence on the 
slope of the For. magn. is proved by infant skulls. On an average 
e tor. magn. m young human skulls has without exception a more 
considerable inclination towards the front than in full-grown ones, 
as will be seen from the following figures. 
Angle of the For. magn. in children's skulls. 
0—1 year. 110, 110, 109, 105, 104, 103, 102,101,100,100,92. 
1—2 years. 100, 110, 110, 108, 106. 
2 years. 107, 107, 106, 106, 103, 101, 95. 
3 years. 110, 110, 108, 107. 
4 years. 114, 109, 106, 105, 100. 
5-6 years. 114, 113, 109, 107, 105, 103, 96, 96. 
7 years. 108, 100, 100, 99, 98. 
8—9 years. 104, 103, 101, 97. 
10—11 years. 110, 104, 104, 101, 100 92. 
The average angle of the human full-grown skulls can from the 
preceding table be set at 100°. And now it is seen that of the 31 
