40-1 



Harris Hawthorne Wilder 



of the diagram (Fig. 3), the supraorbital region of the perfect side 

 is practically normal, and beneath the bony roof formed by the orbital 

 plates of the frontals the two eyeballs (Ar-j-Bl) are related as those of 

 one person, save that they have a tendency to turn their optical axes 

 inwards towards each other, that is, the "perfect"' face is a little cross- 

 eyed. Upon the imperfect side there is, of course, a considerable narrow- 

 ing of the supra-orbital region, and on chiseling off a portion of the 

 roof the double eyeball of this side becomes visible, covered by a double 

 set of band-like muscles. This organ, which in its composition is Al-]- 

 Br, is narrower and more elongated than a single normal eyeball, but is 

 perfectly bilateral in all its details. 



Fig. 24. Under side of the double braiu of the Baldwin Sjmote. 

 The Roman numerals designate the cranial nerves. Note the commissure 

 between the two components (optic?), also the two hypophyses. 



Upon studying both the cranial floor and the base of the double 

 brain the origins of the cranial nerves and their exits from the cranial 

 chamber may be readily determined. They have, however, a two-fold 

 relationship, the one to the brain from which they arise, the other to 

 the apparent face to which they are distributed. This is exceedingly 

 difficult to describe, but may be readily seen by comparing Figs. 23 

 and 24. At their origin they arise in pairs from each brain, quite 

 normally with the exception of the first two, Olfactorius and Opticus, 

 which arise the most anteriorly and in that region of the brain adjacent 

 to the plane of contact, and consequently modified. In this region the 

 two brains are connected by a narrow connective of white matter, which 



