C *93 ] 
having his Malady found out, or obtaining a Cure 
for it ? 
Tis not unlikely, that many defperate Cafes in 
Surgery may arife from fuch Accidents as this. 
V. Some Obfervations on the Spina ventofa; 
by the late Claudius Amyand, Efq\ F.R>S. 
and Serjeant-Surgeon to His Majefty. 
Head May 1 5 • X TT X H AT Pra&itioners generally under- 
r 74 • VV ftand by the Spina ventofa, is a 
Caries in the Bone, from the Extravafation of fome 
{harp Juices within it relaxing the Tone of the Fb 
bres, and fwelling and increafing its Bulk beyond the 
natural Bounds. 
In this Cafe, the Humour, or extravafated Juices, 
pent in the Bone, works it Way out of it, through the 
external Cortex , or into the Joints, or both. By 
Detention it acquires an Acrimony 5 and, like Vine* 
gar, and other acrid Juices, it not only relaxes the 
Tone of the bony Tubes, by mollifying them, but 
alfo, like a Cauflic, it tears and lacerates them. At 
this time the Bone fwells, tumefies, and fpreads * and 
the Sap flowing, running out through the lacerated 
Tubes, overfpreads the Surface, and adds to the Tu- 
mefaction, as the liquid Matter, forming a Callus , is 
indurated there. So that, when this happens at or 
near the Joints, the Bones in Contact are knit toge- 
ther, and the Carioftty is incrufted and cover’d with 
an Exoflofs, in as many Places as the Matter con- 
fined within the Bone, upon breaking the Cortex of 
Bh 2 it. 
