Annals of medical history . s are to be given in alater paper. The accompanying graph () will show how, according to presentevidences, disease has progressed duringthe geological history of the earth. Thetwenty-five divisions on the base line a-d(Fig. 6) represent as many periods of theearths history. The divisions on the verticalline d-b represent the approximate numberof diseases present in each period, as indi-cated by the known fossil lesions. Thetime intervals in the graph are shown as ofequal value, but the geological periods arenot at all of equal duration nor of equalcharacter. Th
Annals of medical history . s are to be given in alater paper. The accompanying graph () will show how, according to presentevidences, disease has progressed duringthe geological history of the earth. Thetwenty-five divisions on the base line a-d(Fig. 6) represent as many periods of theearths history. The divisions on the verticalline d-b represent the approximate numberof diseases present in each period, as indi-cated by the known fossil lesions. Thetime intervals in the graph are shown as ofequal value, but the geological periods arenot at all of equal duration nor of equalcharacter. This should be kept in mind instudying the graph. At the point a we may say that organiclife is first known. It will be seen that theline a-b, representing the history of dis-ease, follows a base level for the first twelveperiods of the earths history. Then the curve gradually rises until, during theCretaceous, at c, diseases and accidents—such as caries, osteoperiostitis, deformingarthritides, necroses, hyperostosis, oste-.
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Keywords: ., bookauthorp, bookcentury1900, bookdecade1910, booksubjectmedicine
