Robert Bennett Bean 407 
the brain through the equator above the axis, through the south pole and 
through the equator below the axis to the original position, describing a 
circle of 360°, the north pole being R. 0°, the south pole R. 180°, and 
intermediate points likewise. These radii are to be represented on any 
plane of Jongitude, and they may be placed so close together as to form a 
plane which will coincide with the anterior halves of L. 0° and L. 180° 
when the radii are R. 0°, with the equator above the axis when the radii 
are R. 90°, with the posterior halves of L. 0° and L. 180° when the radii 
are 180°, and with the equator below the axis when the radii are 270°. 
L. 0° and L. 360° are identical. R. 0° and R. 360° are identical. By 
combining the degrees of latitude and of longitude definite points may be 
located. For example, the vertex of the brain being at the central point 
of the equator above the axis will be L. 90° R. 90°, and the bifurcation 
(or junction) of the Crura cerebri will be about L. 270° R. 270°. ‘The 
point representing the right anterior association center as used in Table 
II would be L. 45° R. 45°, and a similar point in the left hemisphere 
would be L. 135° R. 45°. In this way any other point may be deter- 
mined. The brain center being located, the distance of any point from 
the brain center may be determined. Degrees of latitude are used instead 
of parallels of latitude in order to bring everything to the brain center as 
a basis. To sum up these: There is a north pole, the anterior end of 
the brain axis (R. 0°); there is a south pole, the posterior end of the 
brain axis (R. 180°) ; there is an equator circumscribing a plane which 
passes through the vertex of the brain and through the brain center at 
right angles to the brain axis; there are planes of latitude cutting sections 
of the brain from the periphery to the center beginning at the north pole 
and completing a circle by passing upward and backward to the south 
pole, and downward and forward from this point to the original position, 
the planes being represented by R. 0° to R. 360°; and there are planes 
of longitude cutting longitudinal sections of the brain, the planes passing 
from the horizontal plane of the right hemisphere upwards and to the 
left through a circle of 360° to the original position and being represented 
by L. 0° to L. 360° in their course. 
ADDENDA. 
Certain relevant subjects are not treated at length for various reasons, 
but are simply added as an appendix that anyone who is interested may 
examine, and take for what it is worth. Not much value is attached to 
these subjects, but there may be something of value and interest in them 
as discussed below. 
