78 



ELEMENTARY PHYSIOLOGY 



LESS. 



than in the one described above. Moreover, with a 

 syringe, we can easily inject a Uuid from the vena cava, 



Fio. 24. — Portion of the Web o»- a Froo's Foot seen under a low 

 Maonifyino Power, the Blood-Vkssels only BEiNn rei'REsknted, 



EXCEIT IN THE CORNER OF THE FlELP, WHERE IN THE PORTION MARKED 



OFF TtiF. Pigment Spots are also prawn. 

 o, small arteries ; v, small veins ; the minute tubes joining the arteries 

 of the veins are the capillaries. The arrow.* denote the direction of the 

 circulation. The lartrer artery runnintr straight up in the middle line 

 breaks up into capillaries at jwints higher up than can be shown in the 

 drawing. 



