xxvi Journal of Comparative Neurology. 



tal opercula of the cerebrum and the cerebellar cortex via the substan- 

 tia grisea ponds. The latter has probably other important connec- 

 tions as yet unknown. 



V. Substantia reticularis grisea tegmenti pontis. The cells of this 

 region have large protoplasmic processes which in part join the internal 

 arcuate fibres and in part cross in the raphe to the substantia rettcularis 

 of the opposite side, thus forming a protoplasmic commissure of this 

 region. The axis cylinders of these cells in part cross the raphe, in 

 part join the internal arcuate fibres ; others, arising nearest the raphe, 

 pass dorsally to join the fasciculus medianus ; btill others go to the teg- 

 mentum pedunculi. 



VI. Collaterals of the fasciculus longitudinalis posterior. These 

 pass to the nucleus funiculi teretis, the substantia reticularis tegmenti pon- 

 tis and the nucleus reticularis tegmenti pontis of Bechterew. 



The reader will be struck with the substantial identity of many of 

 these results with those of Cajal upon the brains of the dog, cat and 

 rodent, as described in Bibliographic Anatomigiie, Dec, 1894. 



c. J. H. 



The Influence of the Cerebrum upon the Excretion of Nitrogen.' 



The experiments were performed on pigeons. The cerebrum was 

 removed and after complete recovery the animal was kept fasting for 

 from four to six days. The loss in weight from day to day and the 

 amount of nitrogen contained in the urine were compared with the 

 same data from unoperated specimens under the same conditions. The 

 decerebrated pigeons lost weight much less rapidly than the normal, 

 and the amount of nitrogen eliminated was still more conspicuously less 

 in the case of the decerebrated pigeons. On the other hand, a pigeon 

 which was observed on the days immediately following the operation 

 showed a geater loss in weight and in amount of nitrogen excreted than 

 the normal pigeons. 



The author concludes that the cerebral hemispheres, at least in 

 birds, have a marked influence in regulating the metabolic processes of 

 the body, acting as trophic centres to stimulate the anabolic processes. 



C. J. H. 



* Belmondo, E. Ricerche sperimentali intorno all'influenza del cervello 

 sul ricambio azotato. Rivista di Patol. nerv. e ment., I, 2, Feb., 1896. 



