RAREFYING DISEASE OF THE SKELETON 



421 



Fig. 13C. Photomicrograph of the center of the cortex of the neck of the 

 femur shown in Figs. 13A and 13B. The visceral capsule or vestigial periosteum 

 of the hip is shown at the top. The dense-staining bone matrix lies beneath it. 

 The lacunae are either empty or partly filled with pyknotic nuclei and ab- 

 normal osteocytes (arrow), (x approx. 400.) 



percentage of males with chronic debihtating diseases, but the 

 condition was invariably less severe than in females. The possibility 

 of a hereditary or genetic factor associated with osteoporosis of the 



