Ivi Journal of Comparative Neurology. 



duce hemianopsia. The occipital portion starts from the external genicu- 

 late body, forms a small bundle of fibres and lies in the optical radia- 

 tion as high as the second temporal gyrus, the second temporal sulcus 

 and the calcarine fissure. Lesions of any other segments of the op- 

 tical radiations do not produce any form of hemianopsia. The angu- 

 lar gyrus does not belong to the visual centre in man, but the optical 

 bundle terminates in the cortex of the calcarine fissure. The visual 

 centre is limited to the calcarme cortex. The cortical macula lutea 

 probably lies 3-4 cm. in front of the occipital tip. Both retinal halves 

 are represented in the limited space, elements from corresponding 

 points of the retinas side by side. 



Natural Selection and Music 



Dr. Richard Wallaschek, in a paper read before the International 

 Congress of Experimental Psychology, at its second session, remarks 

 that prmiitive music has no necessary connection with a higher train- 

 ing and evolution of the sense of hearing and the whole development 

 of music has not changed the human ear in any respect. Music is 

 primarily a rhythmical movement and it must be considered in its con" 

 nection with the dance. 



The dance of the savage is not regarded so much the result of a 

 ''surplus of vigor," in the sense employed by Herbert Spencer, as a 

 prolongation of or preparation for warlike efforts which it serves to pre- 

 serve and develop. 



The purpose of music in these cases is to make possible evolution 

 en masse as in the march, etc. A tribe which could not practice con- 

 certed action will have less chance of success in battle than others which 

 have this custom. The progress in art is (as suggested by Weisman) 

 through direct imitation and tradition (" objective heredity ") rather 

 than through heredity in the usual sense. 



The General Morpholoa^y of tlie Brain.' 



Professor His gives a general summary of the development of 

 the brain, accompanied by numerous illustrations of median longi- 

 tudinal sections of the head and brain of all groups of vertebrates at 

 various stages in development. 



The paper cannot fail to contribute substantially to a clearing up 

 of the hazy concepts which seem still to prevail in this important 



1 His, Wilhelm. Zur AUgemeinen Morphologic des Gehirns. Arch. f. 

 Anat. u. Phys. Anat. Abth., 1892. 



