ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 1G9 



in inations. These fibres are first simple, later they divide, and finally 

 the branchings of neighbouring cells interlace to form a plexus. No 

 Schwann cells, from begining to end, are present in these cells. It is 

 consequently certain that the nerve fibres arise simply from the ganglion 

 cells, and it is quite inadmissible that the Schwann cells have to do with 

 the genesis of the axis cylinder or with the peripheral end-branchings of 

 the same. 



Cornu Ammonis in Man.* — E,. "Wiedershiem records having ob- 

 served, in certain old and badly preserved preparations of the human 

 brain, appearances resembling interlocking teeth, in the cornu ammonis, 

 such as Jung had previously described as a " Zackenlager." The author 

 considers this layer a secondary formation in old specimens, and not a 

 normal structure. 



Olfactory Buds in Vertebrates.f — K. Kamon has made a compara- 

 tive histological examination of the olfactory and taste buds in Esox and 

 Trif/hi. He finds numerous differences between these two sets of organs, 

 and considers, in consequence, that Blane's theory of homology is at fault. 

 The epithelial buds, described by Disse, in the olfactory region of mam- 

 mals, particularly in the calf, are not present in these fishes. These 

 buds are simply concentric groupings of olfactory epithelium around 

 invaginations towards the tunica propria. There are neither in the 

 olfactory mucous membrane of fishes nor of mammals comparable 

 formations. 



Structure of Hypophysis in Vertebrates.^ — Gr. Sterzi has inves- 

 tigated this in representative types from Cyclostomes to Mammals. The 

 hypophysis is ahvays formed of two parts — a nervous jirocessus infundibuli 

 and an epithelial saccus vasculosis, but there is great variety in the 

 relative development of these two parts and in their details. The 

 epithelial portion is always composed of two distinct areas, distinguished 

 histologically, e.g. by their staining reactions, as " chromophilous " and 

 " chromophobic." 



Fibrillar Structure in Frog's Liver.§ — Max "Wolff describes remark- 

 able fibrillar structures in the frog's liver, which are not nervous, as 

 Allegra maintained, but connective in nature, and are in close association 

 with the capillary network. The paper includes a discussion of the 

 differential diagnosis of nervous and non-nervous fibrillar elements. 



Adipogenic Function of the Mammalian Liver.|] — C. Deflandre 

 finds that this function, as proved by chemical analysis, is normal in 

 mammals. It is notably augmented during gestation and lactation. The 

 products appear to be absorbed by the foetus from the maternal liver, 

 and accumulated provisionally. Further, in certain food conditions, e.g. 

 after a meal rich in fat, or by transformation into fat of other elements, 

 and in pathological states of fatty degeneration, the adipo-hepatic 

 function is increased. 



* Anat. Anzeig., xxv. (1904) pp. 113-18. 

 t Arch. Micr. Anat., lxiv. (1904) pp. G53-63 (1 pi.). 



X Atti Accad. Sci. Veneto-Trentino-Litriana, New Series, i. (1904) pp. 70-141 

 (9 figs.). § Anat. Anzeig., xxvi. (1905) pp. 135-44 (4 figs.). 



H Journ. de l'Anat. et Phys., xli. (1905) pp. 94-101. 



April 19th, 1905 n 



