clxxviii Journal of Comparative Neurology. 



servations. It is to be regretted that two investigators, both so justly- 

 renowned in the history of cerebral localization, should find it neces- 

 sary to dwell upon the points of disparity in their respective experi- 

 ments, rather than to seek for agreements in observation and harmony 

 of interpretation. To others these observations have seemed not so 

 incompatible as might at first appear. The facts of cerebral localiza- 

 tion, as clinically and experimentally demonstrated, in themselves and 

 aside from any philosophical theories based upon them, contribute no 

 evidence whatever to a solution of the problem of the seat of con- 

 sciousness. That the proper functioning of a given locus in the cor- 

 tex is essential to the execution of a given motion or the reception of 

 a given sensation by no means necessarily implies that the conscious- 

 ness of the act is located there. This latter is an entirely indepen- 

 dent problem which must be separately investigated. It is not, then, 

 the facts of cerebral localization which can be called into question, 

 but the interpretation of these facts, and it is not improbable that the 

 true interpretation lies somewhere between the extremes represented 

 by these two investigators. The thorough discussion which has been 

 provoked cannot fail to leave the subject in much clearer light than it 

 was before, even though neither of the principal participants may find 

 his views accepted in their entirety. 



The Temperature Sense. 1 



Some 5000 tests were made on 30 young men. The various re- 

 gions of the body were tested for relative sensibility to heat and cold 

 by the use of test tubes containing water at temperatures from o° C. 

 up to 70 C. The parts of the body given in the order of their sen- 

 sibility are, (1) abdomen, sacral and lumbar regions of the spine, 

 with the intervening space on each side of the body ; (2) inside of 

 thigh, chest, cervical spine, and upper dorsal spine; (3) inside of arm, 

 outside of thigh, lower dorsal spine, and the soles of the feet ; (4) 

 Front of neck, inside of forearm, palm of hand, inside of leg, and 

 top of foot ; (5) Outside of forearm, outside of leg, and forehead. 



Changes of temperature between 50 C. and 6o° C. produce sen- 

 sations of cold or of heat in all parts of the body with little or no 

 pain. Temperatures beyond these limits cause pain in addition to 

 sensations of cold or heat. These limits approach each other as the 

 size of the stimulated area increases. The surface of the body is 



1 Riley, W. H. A Study of the Temperature Sense, Jour. Nerv. and 

 Ment. Disease, XXI, 9, Sept., 1894. 



