196 JOSEPH DUERSON STOUT 



both to the somewhat inaccessible position of the tissue and to 

 the location of an artery of considerable size between the two 

 lips of the sulcus, or, as it appears on inspection, in the sulcus. 

 The removal of this artery is frequently followed by troublesome 

 hemorrhage, but the results on two animals were sufficiently 

 good to record. 



Stimulations applied to that portion of the posterior bank 

 lying immediately internal to the visible margin of the crucial 

 sulcus resulted, in cat 16, on the left side, mainly in flexions of 

 the crossed hind limb. Stimulation of the inner portion of this 

 bank resulted mainly in movements of the eyes and pupils. 

 Stimulations of the outer margin resulted in movements of the 

 tongue, eyes, nictitating membranes, pupils, mandible and 

 flexions of the hind limb. Stimulations of the portion of the 

 field farthest removed from the surface resulted in movements 

 of the eyes, nictitating membranes and lips. ' These results are 

 shown in figure 17B. 



The only results obtained from the posterior bank of the right 

 crucial sulcus of this animal (fig. 17 A) were from stimulation 

 applied to the 'region immediately internal to the margin of the 

 crucial sulcus and along that portion of the median surface im- 

 mediately adjacent. The stimulation of the former area re- 

 sulted in movements of the mandible, lips, tongue and neck. 

 Stimulation of the latter area resulted in movements of the 

 lids and tongue and flexion of the fore limb. 



The anterior bank of the left crucial sulcus of cat 16 gave the 

 following results (fig. 17C). Stimulation of that portion of the 

 field lying immediately internal to the margin of the crucial 

 sulcus resulted in movements of the eyes and neck from the 

 inner half of the field, and, in addition to these, dilatation of the 

 pupils, movements of the mandible, retraction of the tongue and 

 flexion of the fore limb. Stimulations of the inner margin of the 

 field, adjacent to the median line, resulted in dilatation of the 

 pupils, movements of the lids, retraction of the tongue, and 

 movements of the neck and nictitating membranes. Stimula- 

 tions of the outer margin of the field resulted in dilatation of the 



