BONE. 



Fig. 69. 



[ 91 ] 



Magnified 350 diameters. 



Portion of the outer surface of a tibia of a calf. The 

 dots represent the orifices of the canaliculi, the larger 

 dark indistinct spots are their lacunae seen through the 

 osseous substance. 



^^p^lft;;llj 



^^^'^'^:^imM 



Fig. 71. 





Magnified 300 diameters. 



Part of a transverse section of the shaft of the humerus. 

 a, Haversian canals ; b, c, d, lacunae with their canaliculi. 



Fig. 72. 



Magnified 350 diameters. 



Cartilage of bone, after boiling in water: a, lacunae 

 b nuclei 



a * 



Magnified 450 diameters. 



Lacunae (surface view) with the canaliculi, from the parietal bone. The dots seen 

 upon or between the lacunae represent divided canaliculi, or their orifices opening into 

 the lacunae ; a, a, a, groups of transversely divided canaliculi. 



