136 



GENERAL ANALYSIS. 

 FlQ. 115. 



18234 



FIG. 116. 



Fig. 115, 2, the same as 12, Fig. 

 114; 1, ducts leading the tear-fluid 

 from 2 to 5, covered by 7. 



Fig. 116, 5, same as in 115, extend- 

 ing into the nose at 6. 1, the same as 

 2, and 3 same as 1, of 115. 4, where 3 

 joins 5. (The three preceding cuts 

 beautifully illustrate the tear appara- 

 tus, for so it may be called.) The 

 tear-fluid, formed in the gland, Fig. 

 114, passes down to the eye, and over 

 it, as shown by 115, to the openings 2, 

 from which it glides through the ducts 

 down into the nose. (See Plate 4.) 



THE LINING OF THE MOUTH is kept moist by 

 the saliva, in addition to the mucus, which is supplied 

 to the back part of the mouth in large quantities by 

 the Amygdaloid glands (tonsils), to facilitate the swal- 

 lowing of food. 



517. THE SURFACES OF THE ORGANS IN CONTACT 

 WITH EACH OTHER REQUIRE a very watery fluid, called 

 serum or serous fluid, simply to prevent adhesion and 

 friction. 



Describe Figs. 115, 116. What are remarkable characteristics of tear-fluid? 

 516. What said of ? 517. What said of - ? 



