466 HALBERT L. DUNN 
| ] 
0-5 510 {0-15 1520 «62075 «6530 0) = 0055S 540) =4045> 4550 25055em. 
Fig.25 <A series of curves illustrating the percentage increments of the various 
linear dimensions of the brain, brain parts, and spinal cord. Abscissa: total 
body length in em. Ordinates: percentage increments calculated from the 
formulae of the respective absolute curves. (Data from tables 14, 16, 20, 22, 26, 
30, 32, 37, and 39.) I, percentage increment of fronto-occipital diameter. II, 
percentage increment of temporal diameter. III, percentage increment of vermis 
cerebelli length. IV, percentage increment of vermis cerebelli height. V, per- 
centage increment of pons length. VI, percentage increment of colliculi length. 
VII, percentage increment of frontospinal length. VIII, percentage increment 
of spinal cord length. IX, percentage increment of brain-cord length. 
