SYSTEMATIC SYNTHESIS OF TISSUES INTO ORGANS. 365 



kidney-beans, with a smooth surface, dense to the touch, 

 and SITUATED one on each side of the spinal column, cor- 

 responding to two dorsal and lumbar vertebrae, the right, 

 however, being a little lower ; it is in contact with the 

 liver, the descending duodenum and ascending colon, the 

 left being in contact with the spleen, pancreas, stomach, 

 and descending colon. 



1123. Remark. Sometimes there is only one very large kidney, of 

 an irregular shape, and extending across the spinal column, like the pan- 

 creas ; sometimes the two are connected by a band, the whole having 

 the form of a horseshoe. Sometimes when disease, accident, or exper- 

 iment destroys one kidney, the other increases so as to supply the use 

 of both. 



1124. THE KIDNEYS ABE BURIED in a large quantity 

 6f Adipose tissue, the precise purport of which is not 

 determined, further than that it serves to preserve a 

 uniform temperature in the kidneys. 



1125. A SECTION OF A KID- FIG. 241. 



NEY SHOWS that it is constructed 

 of an external coat or tunic (2, 

 Fig. 241) of sinewy fibres, woven 

 very densely, within which is a 

 granular layer, 3, with a tubular 

 portion, 4, surrounding a cavity, 

 7, from which a tube or duct, 8, 

 9, leads to the vesicle or reservoir. 



1126. AGAIN, THE KIDNEY 

 MAY BE DESCEIBED as constructed 

 of an immense number of minute 9 

 tubes that radiate from the pelvis, 

 7, outward to the granular-ap- 

 pearing cortical part, where it will be found that each 

 granule is a group of capillaries beautifully enveloped 

 by the extremity of the tube. 



1127. THE STRAIGHT PART OF THE TUBE is CONSTRUCT- 



1123. Are the kidneys uniformly two ? 1124. In what are ? 1 125. What does 

 a ? 1126. How may ? 1127. How is ? 



