EXPLANATION OF PLATES. 89 



FIG. 24. From a silver-stained preparation of normal omentum of 

 rabbit, representing a vascular patch, the ground- substance of which 

 F has remained unstained by the silver, whereas the very rich net- 

 work of the branched cells e have become very distinct. 

 M. p. III. 7. 



a. Capillary blood-vessels. 



ft. Growing capillaries ; the growth takes place by hollowing 



of the branched cells which are in connection with the wall of 



the capillary vessels d. 

 c. Vacuolation in the branched cells, as the first step of becoming 



hollowed out and afterwards to become continuous with the 



lumen of a capillary vessel. 



FIG. 25. From a silver-stained preparation of the mesentery of a monkey 

 suffering from chronic peritonitis. 



M. p. II. 7. 



F. Ground- substance not represented. 



a. Different stages of vacuolation of apparently not branched 

 cells of the matrix. Such vacuolated cells becoming united 

 from tubes, the wall of which becomes differentiated in en- 

 dothelial plates a. 



I. Small, c larger nucleated elements of the matrix. 



FIG. 26. From a silver- stained preparation of the omentum of a guinea- 

 pig, as in Fig. 23, representing a villus which projects freely over the 

 surface. Optical longitudinal section. 



M. p. III. 10 a 1'immersion. 



a. Ground substance of the villus, consisting of finely fibrillated 

 connective tissue, containing large granular spindle-shaped 

 looking cells, which in many places, c, are projecting between 

 the enlarged and germinating endothelium ft and c freely 

 up to the surface Pseudo-stomata ; from them also young 

 cells grow up, d. 



FIG. 27. From a silver- stained preparation of the centrum tendineum 

 of a guinea-pig as in Fig. 22. Pleural surface. 



M. p. III. 5. 



a. Common endothelium of the general surface; below it a 

 vacuolated cell, which forms a stoma verum with the surface. 



