microcephalous new-horn pig , etc. 
449 
in the “control” pig. Upon a comparison of Figs. 11 and 12, it 
becomes evident that the pit or depression of Fig. 11 (x) is really 
only the expression of the very sharp and abrupt second cerebral 
Fig. 12. 
flexure. In the series of longitudinal sections this pit-like de- 
pression varies however in its occurrence and this variability is 
just as pronounced in the normal as in the abnormal brain. This 
point seems to merit some further attention, for I observe that the 
Fig. 13. 
Fig. 14. 
distinctness of the depression is not so great in the sections 
nearest the middle line. This rather paradoxical conclusion is 
supported by a comparison of Fig. 13 with Fig. 14. These are 
