404 J. J. KKEGAN 



tlic somalic motor ajid sensory areas of the central region. The 

 histological field was first entered by Flechsig ('96) who de- 

 limited cortical areas by the order of the myelination of their 

 fibers. Campbell ('05) and Brodmann ('07) made piu-ely his- 

 tological surveys of the cortex, but were not able by this tedious 

 method to examine enough material to establish the relation of 

 many cortical areas to fissures. E. Smith ('07) was the first to 

 make such a topographical survey of the human cortex and, 

 while in general the areas plotted agreed with the areas of 

 Campbell and Brodmann, the added value of their interpretation 

 in relation to fissures facilitated greatly the study of the fissures 

 of the cerebrum. 



The value of E. Smith's interpretation is evidenced by its 

 general acceptance for the occipital region by most of the recent 

 writers, as Duckworth ('07), Appleton ('10), Cole ('11), Schuster 

 ('08), and many others. The application of this method to other 

 regions, however, has been neglected, chiefly on account of the 

 difficulty in obtaining fresh material and the inexpertness in 

 distinguishing the lamination in macroscopic sections. The 

 boundaries of the area striata are so easily identified that this 

 area can be plotted even in imperfectly preserved material, 

 which accounts for the general application in this region. 



In this study an attempt has been made to apply by compari- 

 son the cortical area plan of E. Smith ('14) to a valuable cerebrum 

 in which the preservation prevented a knife-section analysis of 

 the cortical areas and their relation to sulci. The accuracy of 

 this method may well be questioned for undoubtedly many 

 small errors are present, but it was found that such a plotting 

 aided greatly in the interpretation of fissures and perhaps made 

 possible a more intelligent comparison of similar cortical areas 

 of the two hemispheres and of other cerebra. It at least furnishes 

 the most expressive figures of the sulci and gyri that present 

 knowledge makes possible and might be applied profitably for 

 comparison to the figures accompanying studies of other brains. 



