. The American journal of anatomy. es all the vessels iu the dorsal finhave been followed, a small area is selected for closer study,and for reproduction, because any section illustrates the funda-mental principles involved in blood-vessel development. In theseries which is reproduced an area was chosen which included anarteriole and a venule and the region between the two, as wellas a part of the regions on either side. This area is sufficientlylarge to make it possible to follow the changes introduced bythe development of new capillaries on the vessels already present. The changes which occu
. The American journal of anatomy. es all the vessels iu the dorsal finhave been followed, a small area is selected for closer study,and for reproduction, because any section illustrates the funda-mental principles involved in blood-vessel development. In theseries which is reproduced an area was chosen which included anarteriole and a venule and the region between the two, as wellas a part of the regions on either side. This area is sufficientlylarge to make it possible to follow the changes introduced bythe development of new capillaries on the vessels already present. The changes which occur in such a selected area are shown infigures 1 to 8, and will now be taken up in detail and analyzed. There is present in the first record a very simple type of cir-culation. An arteriole, or, perhaps better, an arterial capillaryis seen toward the left. Two branches are given off from thisvessel on the right, and two on the left, through which bloodcorpuscles are circulating. In addition there is a third branch 48 ELIOT E. CLARK. APR^ 15
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectanatomy
