294 On the Minute Anatomy of the Alimentary Canal. [Apr. 23, 



This is the case at the pyloric end of the stomach, on the villi, over 

 Peyer's patches, and in Lieberkiihn's glands. 



2. The lining endothelium of the lymph-vessels of the mucosa is in 

 anatomical continuity with the reticulum of nucleated cells (connective- 

 tissue stroma) ; so that it may be said the endothelial cells of the 

 lymphatic vessel are only transformed connective-tissue corpuscles. 



3. In animals killed during the absorption of fat (cream) the fat can 

 be seen in preparations stained by osmic acid as small black particles : 

 (1st) arranged in lines between or around the epithelial cells ; (2ndly) in 

 the basement membrane ; (3rdly) as has been noticed by many previous 

 observers, in the connective-tissue stroma of the villus, whence it can be 

 traced into the lymph-vessel. This indicates that the fat is absorbed by 

 the processes of the connective tissue which exist between the epithelial 

 cells, and thence finds its way by the connective-tissue stroma to the 

 lymph-vessel. 



4. The reticulum of nucleated cells of the mucosa forms a special 

 sheath to the vessels and unstriped muscular tissue. 



In the villi the muscular bundles, having approached the apex, termi- 

 nate, the connective tissue which forms their sheath being continuous 

 with the corpuscles forming the basement membrane. 



In the mucosa of the colon of the rabbit the slender muscle-bauds 

 divide into single muscle-fibres, on which the common sheath is con- 

 tinued. This sheath becomes often connected with peculiar large, oval, 

 nucleated cells lying close under the epithelium. 



5. State of the miwous glands of the tongue in rest and secretion. 

 It has been found, in accordance with the researches of Professor von 

 Ebner, of Graz, that there are two kinds of acinous glands in the tongue, 

 which have been distinguished as serous and mucous the former being 

 always found in relation to the papillae vallatae and circumvallatae, the 

 latter always at the root of the tongue and partially surrounding the 

 former. 



In the course of the present inquiry it has been further found (in sec- 

 tions stained in hsernatoxylin and carmine, made from the hardened tongue 

 of an animal which had been left for a few hours without food) that the two 

 kinds of glands are coloured red and blue respectively ; but in sections 

 of the tongue of an animal killed while feeding, both kinds of glands were 

 stained red, while any mucus in the duct of the mucous glands was 

 stained blue showing that, in the state of inanition, the cells of the mucous 

 glands contain mucus, while, during secretion, the cell-substance is 

 affected by the staining fluids in a manner not unlike that in which ordi- 

 nary cell-substance would be acted on. 



