138 - The Cum^leat Horfeman. CHAP. VI. 



are to hzcauteriz^ed^ are comntonly different in (hape and pro- 

 portion, lb alfo ought the ihapes and fafhions of yoar Inilru- 

 ments to be made accordingly. You are alfo to have a fpecial 

 •care to the heating of your Inftrunients, \A/hich ought to be 

 done with a right good judgment j for as they muft not be 

 too cold, fo ought they not 'to be too hot, for by that means 

 you may eafily inflame the <:<««r<rr?z,f^ places too much. Again 

 in giving the fire great care mull be had to the bearing of the 

 hand, for therein confilleth very great cunning ^ and as I have 

 before admonifhed you to be careful that you touch not any fi- 

 neva or ligament-, fo no fire is to be given to the diilocation or 

 fradion of any bone. And as touching the metal whereof your 

 inltruments are to be made : fome prefer Ge/^, Stiver, and 

 Br^fs or Copper before Steel or lro?i : but I will not controul any 

 mans knowledge, confelGng mine»own to be the ieaft j only 

 thus much I may aver of that little I have (through Godsper- 

 milTion) that having made trial of them all, yet I have ever in 

 all my practice found Iron 2nd Steel to be the very belt and moft 

 certain to work with, of all the other Tfietah j and my reafon 

 ' is becaule Steel or Iron will retain its once received heat longer 

 then any other metat^ whereby I cannot be fo much deceived in 

 my work j for Gold, Silver, and Brafs, as they be foone'r made 

 hot than Iron or' Steely fo are they as foon cold .• now Steel and 

 Iron Metals are much more fubltantial and harder of nature 

 than the other metals be •, and therefore as they are fomewhat 

 longer before they be hot, fo they retain their heat much lon- 

 ger, which during the time of their agitation^ works more 

 furely : again, a man cannot tell when thofe other metals are 

 hot enough, as alfo when they be too hot, if you put never fo 

 . little water to them whereby to allay their overmuch heat, 

 they fuddenly turn and become fo cold as not to be able to 

 make them work at all •, the contrary whereof you Ihall find 

 to be in the nature of Iron and Steel. And let this fuffice for 

 Caurery cautery aSinal. Now I will in a word handle cautery Potential, 

 potential. ^yj^jf has the cautery aciual burneth thtfiefh by the hot inftru- 

 -ment ; even fo doth cautery Potential bmn thtflejh by medicine, 

 ofvs'hich there are three forts or degrees, namely by corrofive^ 

 Corrofive ^Y (^^f^P^^-) 0^ by putrefa^ion : Corrofive is when that is applyed 

 to the wound wherein is deader proud Ai^ to corrode or eat 



it. 



