SEROUS SYSTEM. 261 



it dry, and you will very soon see it covered with new 

 serum from the exhalents. 



Q. How will you have a view of the absorbents? 



A. Macerate a beef's heart for several hours in water, 

 and you will see its serous surface covered with absorb- 

 ents; this among other modes of showing them. 



Q. What varieties of organization do the serous tissues 

 present ? 



t#. Perhaps each membrane has its peculiar structure. 

 There is the thin, soft, tender arachnoides; the thick, 

 compact peritoneum. 



Q. What pathological principle do you derive from this 

 variation in structure? 



<ft. Diversity in disease; greater or less liability to acute 

 and chronic inflammation. 



Q. To what peculiar affection is the pericardium sub- 

 ject? 



*ft. To the formation of thick white layers on its inter- 

 nal surface; such as are not found elsewhere in the serous 

 surface. 



Q. What tissues are exclusively the seats of serous ef- 

 fusion ? 



. The serous and synovial textures. 



Properties of the Serous System. 



\. Properties of Texture. 



Q. Do the serous membranes manifest much extensi- 

 bility ? 



#. From the dilatations they undergo, you would sup- 



