Literary Notices. li 



later observers, who find termini for heat, cold and pressure but none 

 for pain. 



The author concludes that the determinants for pleasure and pain 

 are matters of intensity not of kind and that no paths or loci in the 

 central organs are to be sought. 



The reviewer may add that even though pain or pleasure is due to 

 special intensities this does not prevent us from accepting the possi- 

 bility that a certain degree of excitation may be possible only in case 

 the stimulus has overflowed from the direct tracts and passes through 

 a succession of short circuits in the gray matter of the cord. There is 

 much to suggest that pleasure and pain are associated with summa- 

 tions and irradiations of stimuli, and this fact is also responsible for 

 the close relation which these affections have to the vaso-nervous 

 mechanism. 



Mirror-writing". 



An illustration of this curious peculiarity is given by Dr. C. K. 

 Mills in the Journal of Nervous and Mental Disease for Feb. 1894. 

 A boy of thirteen with right-sided partial paralysis and atrophy writes 

 with the left hand in mirror reverse. The author remarks : "The 

 right side of the brain is not functionless, but its functions are in part, 

 and sometimes largely, in abeyance. When the individual has the 

 perfect use of the left half of his brain — is right handed, has the usual 

 expertness with his right hand, has speech and vision in accordance 

 with his inheritance and his training — impressions which come to him 

 through his eyes are received and transmitted both by the lower and 

 higher visual centres, so as to present to his consciousness a normal or 

 usual image, which, as a rule, has been registred only by a visual 

 centre of the left hemisphere. In this centre the images are usually 

 recognized as right side up ; the image formed on the right side, if 

 one exists, is probably usually suppressed. When now the left side 

 of the brain is destroyed, or when, as in the case of our patient, its 

 development has been arrested, the individual is guided in writing by 

 images formed on the right side of the brain. 



Nerve-Endings in the Teeth. 1 



The author has applied the Golgi method to fishes and lizards. 

 In fishes the nerve fibres course on the surface of the pulp only; while 

 in lizards, as in mammals, there is an axis with dendritic branches. 



'Roese, C. Ueber die Nervenendigungen in den Zahnen. Deutsch. Mon- 

 atsschr. f. Zahnheilk. XI, 2. 



