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. 71. 



Magnified 350 diameters. 



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

 The dots represent the orifices of the canaliculi, 

 the larger dark indistinct spots are their lacunas 

 seen through the osseous substance. 



Fig. 70. 



Magnified 350 diameters. 



Cartilage of bone, after boiling in water, a, la- 

 cunar corpuscles ; 6, nuclei. 



Magnified 450 diameters. 



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

 upon or between the lacunas represent divided canaliculi, or their orifices opening 

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



