EXPLANATION OF PLATES. 



PLATE X. 



FIG. 49. From a pencilled silver- stained mesentery of frog ; slight 

 chronic peritonitis. 



M. p. III. 7. 



a. Small blood-vessels, showing distinctly their endothelinm. 



b. Lymphatic vessels, showing their endothelial wall ; the 



lumen of the vessels contains numerous colourless cor- 

 puscles c. 



At cZ, and towards the left side of the preparation, a lymphatic vessel 

 is seen to be in continuity with the lymph- canalicular system 

 of the ground-substance, in which system also numerous 

 colourless corpuscles are to be found. To the left-hand side 

 of the preparation, where* the drawing is taken from, an 

 abundant emigration of colourless blood-corpuscles can be 

 seen to have taken place from the appearance in which the 

 blood-vessels and the surrounding tissue is found : these 

 colourless corpuscles are seen to pass through the lymph- 

 canalicular system into the lymphatic vessels towards the 

 right-hand side. 



/. Ground- substance, not represented. 



FIG. 50. From the same omentum as Fig. 43. 

 M. p. III. 7. 



a. Vein. 



b. Artery. 



c. Capillaries. 



d. A lymphatic vessel, in which this whole system of blood- 



vessels is invaginated. 



e. Beticulum of nucleated branched cells growing from the en- 



dothelial wall of the lymphatic vessel into the cavity of the 

 vessel. 



FIG. 51. From a fresh preparation of cedematous pleura mediastini of 

 cat, representing a lymphatic cord in profile. 

 M. p. III. 7. 



a. Germinating endothelium of the surface of the cords. 



b. Nucleated buds which are direct offsprings of the reticulum of 



the matrix. There are seen numbers of such protoplasmic 



