AND PHYSIOLOGY. 



289 



eral circulation without passing through the circuitous course 

 taken by the food. 



50G. Effect of Moisture upon t lie Lymphatics.— Moist- 

 ure stimulates these absorbent vessels to a morbidly vigorous 

 action. Hence a person surrounded by a moist atmosphere 

 cr immersed in water itself, will acquire additional weight. 

 And as an excessive use of the eliminating organs of the sys- 

 t3m is injurious, locations for houses should be selected as far 

 as possible on dry places, and not on wet or low land where 

 heavy fresh water fogs prevail. For the same reason damp 

 clothing injures the body, because it unduly stimulates the 

 lymphatics. 



507. Amount of Matter taken up by the Absorbents.— 

 The amount of Chyle and Lymph poured into the blood by 

 the lymphatics and radicles is about one third of the whole 

 amount in the body. 



ORGANS OF SECRETION. 



508. Follicles and Glands —Character of Secretions,— 

 Size of Follicles. — The organs which perform the office of 

 secretion in the body are Follicles and Glands. The former 

 of these are small bodies in the form of sacs or tubes, exist- 

 ing for the most part in the shin and mucous membrane, one 

 end of which opens upon the surface of the membrane, for the 

 discharge of its secretion. The secretion poured from these 

 varies in consistency from the thick wax of the ear, to the 

 limpid juice of the stomach. The follicles vary also in size 

 from tubes perceptible to the naked eye dow^n to those g\ih. of 

 an inch in diameter. 



509. Glands. — The Glands are soft solids of various sizes 

 (the liver the largest) made up of lobules or small bodies of 



506. How does moisture affect the lymphatic action ? How do damp clothes injure the 

 wearer? 507, What is the amount of matter taken up hy the absorbents? 508. What 

 is the anatomy of the follicles? Of what character id their secretion? What is their 

 size? 509. What is a gland? 



