138 PRACTICAL HISTOLOGY [XVII 



(owing to their smaller size) than in the veins; pro- 

 bably in neither can the individual corpuscles be made 

 out. 



The axial and peripheral zones in the arteries and 

 veins; the peripheral zone is small, and under a low 

 power appears free from corpuscles; under a high 

 power one or two white corpuscles may, if the current 

 is not very fast, be seen in the peripheral zone of the 

 arteries; in that of the veins a few white corpuscles 

 and occasionally a red one will be seen moving along 

 comparatively slowly. 



The passage of corpuscles usually in single file 

 through the capillaries. 



The elasticity of the red corpuscles; observe the 

 way in which they bend and become deformed, and 

 then regain their normal shape. 



7. Inflammation. Remove the cover-slip; com- 

 pare the circulation in two adjoining webs under a 

 low power. Soak up the fluid on them ; on one place 

 a drop of xylol, and examine it, comparing it with the 

 other. 



a. The arteries dilate, the veins become larger, 

 and the capillaries much more distinct. 



b. At first the circulation is quicker; later it is 

 slower than at first, though the vessels remain dilated. 



c. The circulation stops after a time (stagnation), 

 the red vessels being distended with blood (if this is 

 not caused by the xylol, add a drop of turpentine). 

 Where the red corpuscles are pressed together, as in 



