477 



sects and with vertebrate and crustacean muscle, which have been al- 

 most exclusively used by more recent workers, the difficulty of making 

 out these minute details of structure is enormously increased by reason 

 of the tenuity of the fibrils of such muscle. I had indeed obtained, 

 at the time I published the former observations, sufficient evidence to 

 be myself convinced that the sarcous elements which make up the prin- 

 cipal disks of ordinary muscle possess a porous structure essentially 

 similar to that of the sarcous elements of the wing-muscles, but I was 

 not then able to demonstrate this structure. It is however shown in 

 the transverse section of a leg-muscle fibre of Harpalus ruficornis, 

 which is represented in Fig. 4. In this preparation, which was also 

 made by the gold method of Rollett, the sarcoplasm is stained, as 

 sometimes happens, by the reagent. Within its meshes are the sections 

 of the fibrils, which are probably larger than natural owing to their 

 being swollen by the formic acid used to assist the reduction of the 

 metal. Within the area of each fibril an appearance is visible, which 

 is almost exactly similar to that of the transverse sections of the 

 sarcous elements of wing -fibrils shown in Figure 2. The conclusion 

 appears legitimate that the similar appearance is in both cases due to 

 a similar cause, viz: the existence of fine longitudinal pores in the 

 anisotropous substance, into which the isotropous fluid may pass dur- 

 ing contraction. 



Edinburgh, May 1902. 



Nachdruck verboten. 



üeber die „Trophospongieii*' der Darmepithelzelleu, nebst einer 



Bemerkung in Betreif einer Ton Prof. Browicz neulicli pub- 



licirten Abliandlung über die Leberzellen. 



Von Prof. Dr. Emil Holmgren in Stockholm. 



Mit 4 Abbildungen. 



Ich habe in dieser Zeitschrift vor einiger Zeit^) mitgeteilt, daß 

 ich meine „Trophospongien" der Nervenzellen auch an anderen Zell- 

 arten wiedergefunden hatte, nämlich an Deciduazellen, an Drüsenzellen 

 vom Pankreas, an Leberzellen, an den Darmkrypten und den Darm- 

 drüsen. Ich kann jetzt hinzufügen, daß ich ähnliche Structureu des- 



1) Einige Worte über das „Trophospongium" verschiedener Zell- 

 arten. Anat. Anz., Bd. 20, 1902, No. 18. 



