. Human physiology : designed for colleges and the higher classes in schools, and for general reading. though different companies may be in close proximity, there isno disagreement nor interference. For example, the buildersof a tooth and the builders of the gum around it, do not en-croach on each other; but each do their appropriate work with-in their assigned limits. Even when different structures areintermingled, as when tendon and muscle mingle together attheir place of union, there is no confusion in the work of thetwo sets of laborers. In Fig. 48 you see the difference in struc-ture betw
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. though different companies may be in close proximity, there isno disagreement nor interference. For example, the buildersof a tooth and the builders of the gum around it, do not en-croach on each other; but each do their appropriate work with-in their assigned limits. Even when different structures areintermingled, as when tendon and muscle mingle together attheir place of union, there is no confusion in the work of thetwo sets of laborers. In Fig. 48 you see the difference in struc-ture between the transparent cornea in the front part of theeye and the white coat, the sclerotic coat, into which the corneais set like the crystal of a watch. It is represented as seenmagnified 320 times. The dotted lines mark the place ofunion. The cornea, a, is a much more open structure, you ob-serve, than the sclerotic coat, b. The builders of these twostructures, though some of them are in such near neighborhood FORMATION AND REPAIR. Hi Concert of action shown in producing different shapes. FIG. never encroach on each other, hut each set adheres strictly toits own kind of work. The sclerotica-makers never go to mak-ing the open work which you see in the cornea. If they shoulddo so at any point there would be a little transparent windowat that point in the white of the eye ; and if the cornea-makersshould at any point make close work like that in the sclerotica,here would be a white spot in the cornea. 164. The concert of action which we observe in the differentsets of formative vessels is to be looked at in another point ofview. It is such that they give a definite and peculiar shape tothe structure which they make. Each bone differs in shapefrom every other bone, each muscle from every other muscle ;and so of other parts. There is very great variety of shape inthe structures of the body ; and each shape can be determinedonly by a certain concert among the builders. That you
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