NOTES AND MEMORANDA. 197 



(2) In the articulation-cartilage, close undsr the synovial 

 membrane, it is possible to inject large districts of cartilage 

 capsules ; thus fine passages connect the capsules. 



(3) By direct pressure of a column of Berlin-blue it is 

 possible to demonstrate directly the fine passages uniting the 

 cartilage capsules. 



As objects of his researches, Budge used feet of calf and 

 sheep, frogs and tortoises. — E. K. 



Further Communication on the Structure of the Cell-Nucleus, 

 with Observations on Ciliate Epithelium.^ By Professor H. 

 EiMER, in Tubingen. (With Plate.) — Continuing his researches 

 on the structure of nuclei of cells (Archiv fur Mikroskop. Ana- 

 tom. Bd. vii and viii), in which he demonstrated within the mem- 

 brane of the nucleus of various kinds of cells the presence of a 

 hyaline zone round the nucleolus, which he called "Hyaloid/' 

 Professor Eimer found this surrounded by a zone of minute 

 granules, which he called " Kornchenkreis " (granular sphere) ; 

 between this and the membrane lies the peripheral opaque part 

 of the nuclear contents. His more recent observations enable 

 the author to say that the above elements of the cell-nucleus are 

 not the result of reagents (Auerbach), but are present in the 

 living unaltered nucleus of various cell-species. 



Professor Eimer finds from numerous observations (ciliated 

 epithelial cells of palate of Salamandra maculata, the large nuclei 

 of cells lining the inner surface of the tentacular wall of 

 Aegineta, the sensory cells and the cells of the ectoderm of Car- 

 marina hastata, the branchial epithelium of Axolotl) that the 

 "granules" of the " Korncheuzone " are only the optical trans- 

 verse sections of numerous protoplasmic filaments, which per- 

 meate the interior of the nucleus in all directions and anasto- 

 mose with each other so as to form a very minute network. 

 This network of filaments extends up to the membrane of the 

 nucleus. But also the above-named ^' Hyaloid " is penetrated 

 by numerous fine threads, which radiate from the " granules " of 

 the '* Kornchenzone " and terminate in the nucleolus. The 

 peripheral part of the nucleus, i.e. the part between " Kornchen- 

 zone " and membrane, contains likewise a dense network of fila- 

 ments. Under a low power it presents an opaque granular aspect, 

 owing to the numerous fibrils being viewed in optical transverse 

 section. 



From this type there are numerous variations as regards the 

 nucleolus and the distribution of the filamentous networks within 

 the nucleus. The filaments of the intranuclear networks are in 



* • Archiv f, Mikroskop. Anatomie,' Bd. xiv, Heft, i, p. 97—117. 



