BONE 



51 



FIG. 60. TRANSVERSE SECTION OF DECALCIFIED HUMAN TIBIA, FROM NEAR THE 

 SURFACE OF THE SHAFT. 



H, H, FTaversian canals, with their systems of concentric lamellae ; in all the rest of the figure 

 the lamellae are circumferential ; s, ordinary perforating fibres of Sharpey ; e, e, elastic 

 perforating fibres. Drawn under a power of about 150 diameters. 



FIG. 61. LAMELLAE TORN OFF FROM A DECALCIFIED HUMAN PAP.IETAL HONE AT 

 SOME DEPTH FROM THE SURFACE. 



.7, lamellae, showing decussating fibres ; b, b, thicker part, where several lamellae are super- 

 posed ; c, c, perforating fibres : the fibrils which compose them are not shown in the 

 figure. Apertures through which perforating fibres had passed are seen, especially in the 

 lower part, , a, of the figure. Magnitude as seen under a power of 200, but not drawn to 

 a scale. 



E2 



