PLATE XLIX. 



FIG. 116. Mesentery, coloured in silver, of guineapig affected in the same manner as in fig. 113. a. Surface 

 endothelium. d. The freely exposed upper wall of a lymph sinus, the endothelial marking of which is seen. 

 On the periphery, however, answering to the free surface of the serous membrane, two distinctly open true 

 stomata, 6, are shown. These communicate in an oblique direction with the lymph sinus. On the right a 

 closed stoma cam be seen. The endothelium, c, which borders the gtomata is in germination. (Oc., 3; Ohj., 7.) 



