256 



Dr. G. Thin. Anatomy of the Skin. [Jan. 16, 



which I have met with, Las furnished the subject of the drawings in 

 figs. 1 and 2. 



The specimen is from the skin of the horse, and was thus prepared. 

 A portion of fresh skin, free of panniculus adiposus, was hardened 

 first in weak and then in stronger solutions of the bichromate, and 

 treated by gum and alcohol before being cut. The deep edge of the 

 sections — the part of the tissue that had been in direct contact with 

 the bichromate solution — showed the structure of the bundles best. 



The transverse sections of many of the bundles were cut up into a 

 mosaic of somewhat rounded polygonal fields (fig. 16 and fig. 2), the 

 measurements across each field varying from 0*0037 to 0*005 millim. 

 Oblique and longitudinal sections of the bundles showed that these 

 fields were sections of primary bundles. The mosaic was not equally 

 distinct in all the bundles, even in parts where the appearance was 

 well brought out. This varying distinctness is seen in fig. 1. 



The sections of the primary bundles being rounded there are small 

 angular spaces between them. These have not been successfully shown 

 in the drawing. 



In this preparation a delicate connective tissue was found between 

 the bundles of the corium in a well marked form. Its extent relatively 

 to the bundles will be best understood by reference to the drawing. 

 As seen in the preparation it was distinctly fibrillar at parts. 



The cells seen in the preparation were in two positions. Some of 

 them were found in the delicate tissue between the bundles ; other 

 cells were found in direct connexion with the bundles. Of the latter 

 cells the greater number seen were applied to the surface of the 

 bundles, but others were found in the substance of the bundles between 

 the primary bundles. 



These cells were all of the endothelial type. In all of them the 

 cell-contour was clearly marked, and in none of those observed was 

 there a trace of a process, or of ridges and depressions similar to those 

 described by some histologists in tendon. The size and form of these 

 cells is accurately shown in fig. 1, and will be better appreciated by 

 reference to the drawing than by any detailed description which I 

 could give. 



EXPLANATION OP THE PLATES. 

 (All the figures except figs. 8 and 10 are drawn by camera iucida.) 



Figure 1. From the corium of the horse, bichromate of potash, gum, and alcohol. 

 Logwood and eosin staining. 



(a.) Delicate connective tissue between the bundles. 



(b.) Secondary bundle cut transversely, showing mosaic formed by the sec- 

 tions of primary bundles, 

 (e.) Cells belonging to the inter-fascicular connective tissue. 

 (d,f.) Cells lodged in spaces in the centre of bundles, 

 (e.) Cell applied to the surface of a bundle, x 375. 



