134 K. S. LASHLEY AND S. I. FRANZ 



5. The partial destruction of the frontal region does not 

 abolish this habit. 



6. So long as the destruction of the frontal pole is not complete 

 the habit is retained, apparently irrespective of what part of 

 the frontal region has been destroyed. 



7. No marked motor disturbances appear after the complete 

 destruction of the stumulable areas of the cortex but in certain 

 cases marked hemiparesis seemed to result from the destruction 

 of the corpus striatum. 



REFERENCES 



(1) This journal, 1917, i, 1-15. 



(2) WATSON, J. B.: Behavior, New York, 1914. 



(3) FRANZ, S. I.: On the functions of the cerebrum. American Journal of 



Physiol., 1902, viii, 1-22. Archives of Psychol., New York, 1907, 

 no. 2, 1-64. 



(4) BURNETT, T. C.: Some observations on decerebrate frogs with especial 



reference to the formation of associations. Amer. J. of Physiol. 

 1912, xxx, 80-87. 



(5) GOLTZ, F.: Der Hund ohne Grosshirn. Arch. f. d. ges. Physiol., 1892, 



li, 570-615. 



(6) ROTHMAN, M.: Demonstration des Hundes ohne Grosshirn. (Ber. iiber d. 



V. Kongress f. exper. Psychol.) Leipzig, Barth, 1912, pp. 256-260. 



(7) ISENSCHMID, R. : Zur Kenntnis der Grosshirnrinde der Maus. Abh. d. Konigl. 



Preuss. Akad. d. Wiss., 1911, 1-46. 



(8) DOLLKEN, I.: Beitrage zur Entwickelung des Saugergehirns. Lage 



und Ausdehnung des Bewegungscentrums der Maus. Neurol. Centbl., 

 1907, xxvi, 50-59. 



(9) BRODMAN, K. : Vergleichende Lokalisationslehre der Grosshirnrinde. Leip- 



zig, 1909. 

 (10) FRANZ, S. I. : Opus cit. 



PLATE I 



FIG. 22. Serial horizontal sections, 1.6 mm. apart, of the brain of the rat de- 

 scribed in experiment 22. The positions of the structures used as reference 

 points in the descriptions of the lesions are noted on the figures. C.ex., external 

 capsule; c.st., corpus stratium; /., fornix; f.c., forceps of the corpus callosum; 

 h., hippocampus; n.c., anterior olfactory nucleus; n.L, lateral thalamic nuc- 

 leus; o., base of olfactory bulb; s.p., septum pellucidum; v.l., lateral ventricle. 



FIG. 38. Serial sections of the brain of the rat described in experiment 38. 

 The method of reconstruction is shown in this and plate II, figure 38. 



FIG. 36. Horizontal section through the brain of the rat described in experi- 

 ment 36. 



FIG. 39. Horizontal section of the brain of the rat described in experiment 

 39, showing a probable complete destruction of the left hemisphere. 



