Being the Iltinlerinn Lecture de1ir:ered ut Ih? Rognl College of .Sicrgeons of Enzland 0 t h Feb. 13, 1921.)OSTF:OCEKESIS impcrfectta is tlic name givcn t o a diseasc whicth is charactcrizcd by a congeiiital defect in thc ovolution o f the ostcoblast, and recognized cliriioally by defective ossification of thc craniurri and a multiplicity of fracturcs resulting from trivial ('auscs.Cascs, now recognized as instanccs of this affcction, are srattcred throughout literature u~id(tr such titles as fetal rickct s, idiopathic. fragilitas ossium, and osteopsathyrosis ; whilst Porak a i d Durantc have suggested the name of the true pelvis has the shape of a triangle with the corners rounded. 'l'he lei1 ilium is fracturcd transversely a little bclow thc crest." In the right lozver extremitJl thc femur is bent outwards and the leg boncs prominently forwards, so that the thigh and leg bones display a scniicircrilar The 5th metae(irpa1 bone is fractured at its lower end.
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