468 HALBERT L. DUNN 
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0 | id 9) at 5 6 {( 6 9  10mos. 
Fig.27 A series of curves illustrating the percentage increments of the various 
linear dimensions of the brain, brain parts, and spinal cord when interpreted in 
time in fetal months (as determined by Mall’s convention). Abscissa: total 
time of fetal life inmonths. Ordinate: percentage increments calculated from 
the formulae cf corresponding absolute curves and transposed into time. (Data 
from table 41.) I, percentage increment of fronto-occipital diameter. II, 
percentage increment of temporal diameter. III, percentage increment of pons 
length. IV, percentage increment of colliculi length. V, percentage increment 
of spinal cord length. VI, percentage increment of brain-cord length. VII, 
percentage increment of frontospinal length. VIII, percentage increment of 
vermis cerebelli length. IX, percentage increment of vermis cerebelli height. 
