244 



MUCOUS SYSTEM, 



ft. Experiments contradict the supposition, 



Q. Does the redness of this tissue depend on the blood 

 circulating in the arteries? 



<fl. It does not; it arises from the colouring matter of 

 the blood combined with the texture. 



Q. Why is it of so much importance to know the nor- 

 mal colour of the mucous membranes? 



*#. In order to decide on their pathological state. 



Q; How do the exhalents on this texture favour haemor- 

 rhage? 



JL. By the course being so very short from the artery, 

 through the exhalent, to the mucous surface. From this 

 it is inferred that haemorrhage is from exhalation and not 

 from rupture; and haemorrhage is incomparably more fre- 

 quent from this, than from other textures. 



Q. What forms the pulmonary perspiration? 



#. A considerable portion of it is a solution of the mu- 

 cous fluid which lubricates the bronchiae. 



Q. How is absorption evidenced in this texture? 



#. By the absorption of chyle and fluids swallowed, 

 on the intestinal surfaces; by the absorption of morbid 

 matters; by the absorption of the urine in the bladder; by 

 the absorption of turpentine vapours on the bronchial sur- 

 face. 



Q. How do the mucous and serous absorptions differ? 



#. Exhalations and absorption are relative to each 

 other, and regular on the serous surfaces; but not so on 

 the mucous. 



Q. What nerves supply the origins of the mucous sur- 

 faces ? 



#. Where these surfaces are in relation to external bo- 



