44 Journal of Comparative Neurology. 



Another, though less complete, series of experiments has 

 the same relation to the auditory apparatus as the one mention- 

 ed has to the optic apparatus. I have already alluded to the 

 connection found between Munk's area B (Horsphaere) and the 

 posterior corpora quadrigemina. In a most valuable paper/ he 

 explains the character of the striae acusticae (s. medullares) as a 

 secondary tract of the auditory apparatus, originating from the 

 long ganglion-cells of the tuberculum acusticum, whereas the 

 posterior auditory root ends in the deep layer of the tubercu- 

 lum. It is certain that the striae acusticae form part of the 

 lower fillet and that, most likely, part of them end in the 

 posterior corpora quadrigemina and especially in the internal 

 geniculate body. In an early paper^ v. Monakow had proved that the 

 so-called external auditory nucleus, or nucleus of Dieters, as v. 

 Monakow calls it, has nothing whatever to do with the auditory 

 apparatus. I merely mention another of v. Monakow's contri- 

 butions^ which deals with the fornix and the bundle of Vicq 

 d'Azyr, showing that the latter cannot be a direct continuation 

 of the former. 



The reader of these notes will see how all these works have 

 a certain logical connection, as they concern the study of 

 sensory paths of the brain. It is very interesting to see what a 

 great number of facts has been produced in this field by the use 

 of V. Gudden's method. It is to be hoped that Dr. v. Monakow 

 will be able to carry out his researches on the auditory centre 

 in the same thorough and successful manner which we so ad- 

 mire in his work on the optic centres, and that he will develop 

 before long the deductions drawn from the numerous facts with 

 regard to the general architecture and the physiology of the 

 brain. Dr. v. Monakow is still in the commencement of his 

 career. Besides a successful practice in nervous diseases, his 

 activity in his private laboratory — which is open to students of 

 the university, and his lectures at the university, secure to him 

 and to us an outlook for eminent work in neurology. 



^Striae acusticae und untere Schleife. Archiv f. Psychiatric, Bd. XXII. Heft I. 



^Experimenteller Beitrag zur Kenntnis dcs Corpus restiforme, des " ausscrn 

 Acusticus Kerns" und deren Beziehungen zum Riickenmark. Arch. f. Psychi- 

 atric Bd. XIV. Heft I. 



^Einiges iiber secundare Degeneration im Gehirn. Schweizer arztl. corr. 

 Bl. XVI. p. 3q8, 1886. 



