. Quain's elements of anatomy . yed. The red disks, when blood is drawn from the vessels, sink in theplasma; they have a singular tendency to run together, and to cohereby their broad surfaces, so as to form by their aggregation cyhndricalcolumns, like piles or rouleaus of money,and the rolls or piles themselves jointogether into an irregular network ( and 23). Generally the corpusclesseparate on a slight impulse, and theymay then unite again. The phenomenonis most readily explained by supposingthe substance composing the corpusclesto possess a slight natural adhesiveness(Lister), It wi
. Quain's elements of anatomy . yed. The red disks, when blood is drawn from the vessels, sink in theplasma; they have a singular tendency to run together, and to cohereby their broad surfaces, so as to form by their aggregation cyhndricalcolumns, like piles or rouleaus of money,and the rolls or piles themselves jointogether into an irregular network ( and 23). Generally the corpusclesseparate on a slight impulse, and theymay then unite again. The phenomenonis most readily explained by supposingthe substance composing the corpusclesto possess a slight natural adhesiveness(Lister), It will take place in bloodwhich has been in any way brought toa standstill within the living vessels as well as in blood that has stood for some j^. „„ t, 1 <?. •;_ 1 1 T 11 Fig. 23,—Red corpuscles collected hours after it has been drawn, and also ^^^^ j^olls (after Henle), when the globules are immersed in serum in place of liquor sanguinis. The corpuscles alter their shape on the slightest pressure, as is well Fig, 26 THE BLOOD. seen ^YhiiG they move within the vessels ; they ure also elastic, for theyreadily recover their original form. The human blood-corpuscles, as well as those of the lower animals,often 23resent deviations from the natural shape, which are most pro-bably due to causes acting after the blood has been drawn from thevessels, but in some instances depend upon abnormal conditions pre-viously existing in the blood. Thus, it is not unusual for many ofthem to appear shrunken and crenated, when exposed under themicroscope (iig. 21, c, c; fig. 24,/), and the number of corpuscles soaltered often appears to increase during the time of observation. Thisis, perhaps, the most common change ; it occurs whenever the density ofthe plasma is increased by the addition of a neutral salt, and is one ofthe first effects of the passage of an electric shock. The corpuscles maybecome distorted in various other ways, and corrugated on the surface;not unfrequently one o
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