GROWTH OF THE FETAL CENTRAL NERVOUS SYSTEM 4097 
central nervous system into its component parts; 3) observations 
upon the relation of volumetric and lineal measurements of the 
nervous system, and, 4) a summary of the proportions which the 
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Fig. 21 Field graph and curve of the growth of the spinal cord in weight and 
volume during fetal life. Abscissa: total body length in em. Ordinate: spinal 
cord weight and volume in grams (cc.). Individual cases indicated by solid 
dots (for weights) and by circles (for volume). Curve drawn to the formula: 
Y = 0.01 [(0.17X)?-57 + 11.0]. (Data from tables 33, 34, 35.) 
various brain parts form of the encephalon in prenatal life. The 
consideration of the growth of the fetal brain and the spinal cord 
in relation to the postnatal changes of these structures is reserved 
for a later publication. It is hoped also that it will be possible 
