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Age 22-24. Pliase 2 :-Foresliadowing of ventral bevelling with slight indication of dorsal margin. Phase 3:-Progressive obliteration of ridge and furrow system with increasing definition of dorsal margin and commencement of ventral rarefaction (bevelling). Age 25-26. Phase 4:-Con1pletion of definite dorsal margin, rapid increase of ventral rarefaction and commencing delimitation of lower extremity. Age 27-30. Phase 5:-Commencing formation of upper extremity with increasing definition of lower extremity and possibly sporadic attempts at formation of ventral rampart. Phase 6:-Development and practical completion of ventral rampart with increasing definition of extremities. Phase 7:-Changes in symphysial face and ventral aspect of pubis consequent upon diminishing activity, accompanied by bony outgrowths into pelvic attachments of tendons and ligaments. Phase 8:-Smoothness and inactivity of symphysial face and ventral aspect of pubis. Oval outline and extremities clearly defined but no "rim" formation or lipping. Age 45-50. Phase 9 :-Development of "rim" on symphysial face with lipping of dorsal and ventral margins. Age 50 and upwards. Phase 10:-Erosion of and erratic, possibly pathological osteophytic growth on symphysial face with breaking down of ventral margin.

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THREE FIGURES AVERAGE CRANIAL THlCKNESS AND ITS RELATION TO AGEA study of the thickness of the cranium needs no introduction. Our information upon the subject is scanty in the extreme. Krause indeed makes the following statement : "Die Wandungsdicke betragt ca 15 mm. an der Protuberantia occipitalis externa ; am Schiideldach schwankt sie zwischen 5-7 mm. und sinkt auf 2 mm. an der Squama om. temporium.,'(2). More precise data are not available. It has long been held that in old age the cranium becomes thinner, although Henle (I) reminded his readers that Lucae (3) had questioned whether the diminishing weight of the skull in senility might not be associated with atrophy in the facial skeleton rather than with changes in the cranial bones.I n order to obtain more exact information on the thickness of the cranium and its relation to age, I have taken measurements upon 448 male white crania of known age o r of age determined to within a year or two by methods which I have previously outlined, and I have subjected this material to a detailed examination the results of which I propose now to record. Each skull was set up on the Reserve Craniostat (5'6) in the Frankfort plane; the maximum glabellar length and auricular height were determined. ?Vith Plower's craniometer the maximum breadth was obtained and the Eurya marked. The points involved in these measurements were penciled upon the cranium. The skull being already bisected, 245 THE ANATOMICAL RECORD, TOL. 27, NO. 5