412 HALBERT L. DUNN 
projection of the temporal lobe. This pomt becomes less defi- 
nite in large fetuses, but can still be recognized with sufficient 
accuracy. 
5. FS: Frontospinal length; from the frontal pole of the 
cerebral hemisphere to the point of origin of the first cervical 
nerve. This measurement was taken to the middle of the body 
of the first cervical vertebra, for it was sometimes difficult to 
identify the first cervical nerve because of error in securing exact 
midsagittal sections of the brain and the spinal cord. 
6. SC: Spinal cord length; from the point of origin of the 
first cervical nerve to the tip of the conus medullaris;.the meas- 
urement was made with cord in situ. 
7. BC: Brain and cord length; the sum of S C (6) and 
FS (5). 
8. PL: Pons length; the greatest inferior length of the pons. 
9. CL: Colliculi length; from the most anterior point of the 
superior colliculus to the most posterior point of the inferior 
colliculus. 
10. VL: Vermis length; the greatest length of the vermis 
cerebelli parallel with the axis of the pons and medulla. 
11. VH: Vermis height; the greatest height of the vermis 
cerebelli perpendicular to the long axis of the pons and medulla. 
12. VSC: Volume of the spinal cord; cord taken from the 
first cervical nerve to the tip of the conus medullaris and freed 
of meninges and nerve roots. | 
13. VPM: Volume of the pons and medulla; pons and 
medulla cut posteriorly at the first cervical nerve and anteriorly 
just in front of the pons, meninges removed. 
14. V MB: Volume of the midbrain; the midbrain was cut 
just in front of the pons posteriorly and just in front of the 
superior colliculi and through the pedunculi cerebri behind the 
mammillary bodies anteriorly, meninges removed. 
15. VC: Volume of the cerebellum; the velum medullaris was 
severed anteriorly and posteriorly to free the cerebellum from the 
pons and medulla, meninges removed. 
16. VRH: Volume of the right hemisphere, meninges re- 
moved. 
