£52 ESSAYS AND OBSERVATIONS 



bone carlou?, without laying it bare*. 

 Some people have imagined, that the 

 caries of bones accompanying aneurifms 

 was not produced in any of the manners 

 juft now mentioned, but that the blood 

 ferved as a menftruum for diflfolving the 

 bony matter. Numerous cafes, howe- 

 ver, of offifications j occurring in aneu- 

 rifms, 



* Ruyfch mentions two cafes where the ribs were ca 

 rious, althouj^h the cyfts of the aneurifras were entire : 

 Obfervat. Anat. 37. Da Vernoy gives us the cafe of 

 nn aneurifm of the aorta, which had made pits in the 

 Tertebrae, which were lined with a membrane : Ada 

 Petropolitan. 



f Ambrou Pale telis us, that the internal furface of 

 an aneurifm of the arteria venofa was quite ofTified : 

 De Tumor, contra Naturam, lib. 6. cap. 20. The in- 

 ' fide of an aneurifm of the aorta was lined almoft all o- 

 ver with long lamella, fome larger, fome fmailer, like . 

 fo many ftells : Lafage in Phil. Tranfa£l. No. 267. 

 De Haen fays, -he twice found aneurifms covered with 

 bony incruftatlons on the infide, not continued over all 

 tlie internal furface, but interfperfed like fo many little 

 iflands : Ratio Medend. part. 4 cap. 2 p» 15. Haller 

 fays, the external membranes of an aneurifm of the a- 

 orta which he examined had a number of little fcaly 

 excrefcences, the moft part of which (vere cffified, or, 

 at leaft, had a bony appearance : Opufcul, Patbolog. 

 '■' - ^ oin 



