330 



DETAILED SYNTHESIS. 



949. Remark. In the same manner as the hearts may be said to 

 be a modification of a portion of the veins, so may the arteries be said 

 to be an extension of the heart into every part of the body. 



Lymphatics. 



FlG - 216 - 



950. LYMPHATICS GENER- 

 ALLY COMMENCE as a network 

 of capillaries, larger than those 

 of the red Blood, as represent- 

 ed in the adjoining cut of those 

 of the skin of the ear. (See 

 also Fig. 91.) In the papillae 

 of the second stomach they 

 commence, as shown by Fig. 

 88, as club-shaped tubes. The 

 form of the network differs in 

 different kinds of organs. 



951. LYMPHATIC CAPILLA- 



RIES ARE CONSTRUCTED of Walls 



more delicate than even those 

 of the red blood capillaries. 

 952. THE LYMPHATIC TUBES OR VESSELS COMMENCE 

 from the network, as the veins do from theirs, the 

 membrane of the capillary walls being continuous with 

 the basement membrane of the tubes, in which it is 

 lined with cells, and surrounded with sinewy fibres, not, 

 however, so thickly as that of the veins. 

 FIG. 217. 



949. What may arteries be said to be! 950. How do ? 95L How are J 

 952. How do - ? Describe Fig. 217. 



