The Excitnlilr CorU'X of the ( '|jiiiijmii/,cf. < )raiii;-l tan. and (iorilla 145 



repnxliictioii. In tin maps as ;jiveii here the si/e of the miiiieials has been 

 enhiii^t'd. hut the orit^iiial size of the map as a whoh- retained. Tliis has 

 necessitated th»' omission of some of tlie numerals written in the orif^inals ; 

 the omitted numbers are foi- tlie niost part those indieatin<; responses 

 similar or nearly similar to others at nei<;hlKmrin<^f points and included in 

 the reproductions. In some of the maps the tifjure is written at certain 

 l)oints to indicate that from tlmsf |)oints no motor response was obtained. 



The numerals in the nuips and plans refer to the numerals prefixed to 

 tht; motor responses furnished in tin- List of Responses. Thr place of fach 



Fig. 1. — A, cliiiniiaiizff 3. li't't lieiiiisphere. l>, chimpanzee 4, left lieinispheie. 

 Tlie muncnils ri't'er to the '" List of KcspuiLses,"' p. 148. 



numeral inserted in the map indicates the position of the spot whence, in 

 the particular hemisphere from which the map was made, that response as 

 listed was evoked by faradisation. The topographical item thus obtained 

 has to be accepted as a datum for " localisation," subject to the caven-t 

 entered by the prefatory remarks on the functional instability of cortical 

 motor points. The maps show that the same numeral or letter, i.e. the 

 same movement, does not always appear at the corresponding point of 

 different hemispheres, either right or left. The letters C, O, G prefixed to 

 the numerals in the list indicate that that particular response appears 

 figured in one or more of the maps reproduced, chimpanzee, orang, and 

 gorilla being signified by the corresponding initial. The words "contra- 

 lateral '" and " opposite " mean always contralateral, or on the opposite 

 half of the body to the hemisphere stimulated. 



