[ *°4 ] 
Bone, by giving a free Vent to the Matter, will af- 
ford as the neareft Profped of a Cure in the Spina 
vent of a of ail Bones, fo that muft be the Work of 
the Surgeon, when that Diftemper breaks out to- 
wards the Centre of long Bones. 
3°. Thar, in the Spina ventofa affeding long 
Bones towards their Centre, the Application of the 
Trepan , or of any other Xnftrument as fhall take away 
a confiderable Portion of the Subftance, is particularly 
neceflary, were it only to make way for the Removal 
of fuch Exfoliations as are detached from the inner 
Cavity of the Bone in the firft Stage of the Diftemper * 
which, in the two Cafes before us, were concealed 
and (hut in ; and, in many others, may be wedged and 
locked in by the Induration of the callous Matter 
on the Surface of the Bone, as may appear in the Fi- 
gures annexed > Tab. II. Fig. 3 - BB. 
4°. Thar, in a Spina vent of a, in the Centre of 
long Bones, tho’ the Difcharge attending it is not 
great, if any of their Joints are made ftiff by an 
AnchyloJiSyViz. by a callous Expanfion that fhall fol- 
der together the Bones in Contad, the only Refource 
will be the immediate Amputation of the Limb; for- 
afmuch that, if that is delayed till the Patient labours 
under a hedic Fever, colliquative Sweats, a ‘Diar- 
rhoea, or fuch Symptoms as denote a Reflux of the 
Matter pent up in the Bone into the Mafs of Blood $ 
the Operation then will afford us very little Hopes 
of Succcfs : Whereas the Spina ventofa that affeds 
the Extremities of long Bones only, and that which 
appears in fcrophulous Cafes in the Bones of th z Car- 
pus and Tarfus , when the Difcharge is not great, 
are 
