30''2 I. REICIIBORN-KJENNERUD 



down of alveolar bone as shown by x-rays; in others, alveolar bone 

 destruction appears when few or no clinical symptoms of gingivitis 

 are present. 



The former tvpe of periodontal disorder is usually seen in growing 

 indi\'iduals, seldom in \oung adults. In histological sections from 

 the periodontia of growing indixiduals with gingivitis and no loss 

 of alveolar bone, it can be observed that thev have alveolar bone 

 resorption, but that a pronounced bone production simultaneously 

 occurs, and often in the same bone marrow space (Figs. 3 and 4). 





4.. '■ 



Fig. 2. An extended artery in a septnm has compressed a dilated vein. There 

 is a fil:)rosis between the vessels. ( X 200.) 



