366 DETAILED SYNTHESIS. 



ED of basement membrane lined with cells, while the 

 outer extremity is constructed of the membrane only, 

 and the water of the Blood circulating through the 

 group of capillaries there, can exude very freely when 

 occasion requires, washing out the eliminations from 

 the cellular part of the tube, where they are excreted. 

 Veins arise from the group of capillaries, and lead to 

 capillaries around the tubes. There are, therefore, two 

 classes of capillaries in the kidneys, and a peculiar cir- 

 culation. 



1128. THE ARTERY LEADING INTO THE KIDNEY is lar- 

 ger, in proportion to the size of the gland, than the ar- 

 tery leading into any other part except the brain. The 

 artery divides and subdivides among the tubules, until 

 microscopic twigs reach the capillaries of the granules or 

 Malphigian bodies, and the veins smaller in capacity than 

 the arteries lead back first to the capillaries of the tubules, 

 and again others arising from them, lead out of the kid- 

 ney by the side of the arteries. Nerves also extend 

 through all parts of the kidney. 



1129. THE STRUCTURE OF THE KIDNEY INDICATES that 

 it is adapted to a double use, which is the removal of 

 water and the elimination of waste matter, produced by 

 the action of the brain in particular, much of which is 

 in a crystalline form, or readily become such. They are 

 illustrated in the following figures of urates and phos- 

 phates. 



FIG. 242. FIG. 243. 



1128. Wbfit said of ? What inference might be deduced from size of renal 

 and branial arteries? 1129. What does T What do Figs. 242 to 246 represent? 



