Litetaty Notices. xix 



generation of the pyramidal tracts with slight degeneration of other 

 systems, particularly the direct cerebellar and Goll's columns. 



Innervation of the Heart of the Frog 1 . 



W. Nikolajew, in the Arch. f. Anat. u. Phys. , suppl. for Phys. 

 Part, 1893, offers a preliminary study which may be summed up as 

 follows : 



The vagus of the frog contains fibres which end in the pericellu- 

 lar nets and whose origin is in the medulla. Since the pericellular 

 net simply lies upon the protoplasm of the nerve cells without enter- 

 ing the cell substance, the influence on the nerve cell must be by con- 

 tact simply. The pericellular net is accordingly analagous with fibre- 

 endings within the central system. 



Nerve-Termini in the Lachrymal (xland of Mammals. 



Professor A. S. Dogiel 1 comes to the following conclusions re- 

 specting nerve-termini in the lachrymal glands : (1). Its fibres, which 

 surround the blood-vessels and ducts and for the most part enter 

 with them, are almost exclusively nonmedullated. (2). The nerve 

 fibres and branches produced by their division surround the tubules 

 with few loops and form a meshwork lying upon the membrana pro- 

 pria. (3). From this network fine branches and fibres pass out and 

 pass through the membrana propria. These fibres gather about the 

 bases of the glandular cells and by crossing and blending form a supra- 

 cellular network. (4) . Very small fibres pass from the last mentioned 

 and form an inter-cellular network in whose meshes the cells lie. 

 (5). The occasional appearance of free termini is misleading being 

 due to imperfect coloring. 



The above arrangement is considered typical for all serous if 

 not all mucous glands. 



The author seems unaware of the work of Dr. Berkley along sim- 

 ilar lines. 



The Course of the Optic Fibres in the Frog. 2 



The author found Marchi's method imperfectly applicable to the 

 study of degeneration phenomena in cold blooded vertebrates and ac- 

 cordingly employed Weigert's process for the most part. The devel- 



1 Arch.f. mik. Anatomie, XL, 4. 



2 Wlassak, R. Die optischen Leitungsbahnen des Frosches. Arch. f. Anat. 

 u. Phys. Phys. Abth., 1893, Supplement. 



