BONE 



51 



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

 SURFACE OF THE SHAFT. 



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

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

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



FIG. 61. LAMELLAE TORN OFF FROM A DECALCIFIED HUMAN PARIETAL BONE AT 

 SOME DEPTH FROM THE SURFACE. 



a, lamelli 

 posed 

 figure 

 lower 

 a scale 



e, showing decussating fibres ; b, 6, thicker part, where several lamella? are super- 

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

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

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



E2 



