SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



VOL. 35. NO. 3, PL. 34 



Fig. 419 Fig. 420 Fig. 421 



Femur of an Australian. No, 227420, U. S. N. M. Left femur of a male white. No. 94, C. M. C. Right femur of a mule white. No. 142, M. D. N. U. 



MAN (AUSTRALIAN; WHITE RACE) 



Fig. 423 Fig. 424 • Fig. 425 Fig. 426 



A single Haversian system Haversian system showing Haversian system showing Haversian system showing 



enlarged showing lamella; early stage of senility later stage of senility latest stage of senilitv 



DIAGRAMS SHOWING STACKS OF SENILITY 



