EoiTORiAL, iVruro/ooy and Psyc/ioloi*'v. igi 



line drawn perpendicularly to the longitudinal fissure from 

 the sylvian fissure over the dorsal cortex limits a cephalic 

 motor from a caudal sensory region, and marked out the now 

 famous areas constituting the recollection centres of sight 

 and hearing, laying much stress upon the fact that there is a 

 gradual restoration of function in the case of vision. The 

 restitution, instead of being due to a vicarious substitution of 

 the corresponding organ of the opposite side, he ascribed to 

 an acquisition of new vestiges by uninjiired adjacent areas of 

 the same hemisphere. The discrimination of disturbances ot 

 hearing made necessary simultaneous extirpation on both 

 sides, an operation too severe to permit long subsequent ob- 

 servation for the determination of the period of restoration, 

 if such exists. 



The second paper(') covers experiments upon atrophy or 

 failure to develop in the cortical areas previously located in 

 the case of puppies deprived of organs of vision and hearing. 

 The experiments were carried on in duplicate with animals of 

 the same litter and with ample control, giving results seem- 

 ing to show that early loss of the eye produces slight but no- 

 ticeable limitation in the development of the occipital 

 region, etc. These results stand in opposition to those of 

 Gudden, and the author admits that the macroscopic 

 changes are on the whole insignificant, though sufficient 

 in some cases to produce thickening or other modifications in 

 the skull. 



The third communication extends the investigation to in- 

 clude the monkeys, the results agreeing with those derived 

 from the dog, except that in the monkey total extirpation of 

 the visual region produces hemiopia, in other words, the vis- 

 ual fields of the two eyes overlap and optic fibres are distrib- 

 uted accordingly. Moreover, he was able to locate with 

 more or less certainty the centres of general sensation within 

 the motor areas. So complete a coincidence between the 



I Jierliner klin. Wochenschrift, No. 35, 



