of Animal Sub/lances* 
32 7 
bone, which was inferted in the Philofophical 
Tranfa&ions, vol. LI. part the fecond, for the 
year 1760, in which Nature was difappointed 
of her ufual method of throwing out a callus, 
and after more than fix months had elapfed, 
without an union j when all obftacles were re¬ 
moved, by cutting off the ends of the bone, the 
offeous matter fliot out as freely as if it had 
been from a recent frafture, and the broken bone 
was perfe&ly united. Since the publication of 
this cafe, a great number of fimilar ones have 
occurred both to myfelf and others, which incon- 
teftably prove, that though Nature is difappointed 
in her work, even for a long time together, yet, 
when all obftruftions are removed, flae is ever 
ready to exert herfelf. 
In the year 1768, I cut off the upper head of 
the os humeri of Edmund Poilit, aged fourteen, 
whofe cafe is related in the LIX. volume of the 
Philofophical Tranfaftions. This was much 
corroded with matter, part of it confumed, and 
followed by an exfoliation of a large piece of the 
whole fubftance of the bone j yet the head neck, 
and part of the body of it were a&ually regene¬ 
rated, and the entire ufe of the joint preferved. 
Mr. William Johnfton, furgeon at Dumfries, 
has given 11s a cafe in the Edinburgh Medical 
JSflays, * where the whole tibia, the principal 
• Vol. V. p. 452. 
Y 4 
