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II.  Of  the  Heat , Sec.  of  Animals  and  Vegetables . 
By  Mr.  John  Hunter,  F.  R.  S. 
Read  June  19,  and  Nov.  13,  1777. 
T N the  courfe  of  a variety  of  experiments  on  animals 
and  vegetables,  I have  frequently  obferved  that  the  re- 
fill t of  experiments  in  the  one  has  explained  the  ceconomy 
of  the  other,  and  pointed  out  fome  principle  common  to 
both;  I have  therefore  collected  fome  experiments  which 
relate  to  the  heat  and  cold  of  thofe  fubftances.  Having- 
found  variations  in  the  degree  of  heat  and  cold  in  the 
fame  experiment,  for  which  I could  not  account ; I fuf-~ 
peCted  that  this  might  arife  from  fome  imperfection  in 
the  conftruction  of  the  thermometer.  I mentioned  to 
Mr.  ramsden  my  objection  to  the  common  conftruCtion 
of  that  inftrument,  and  my  ideas  of  one  more  perfect 
in  its  nature,  and  better  adapted  to  the  experiments  in 
which  I was  engaged.  He  accordingly  made  me  fome 
very  fmall  thermometers,  fix  or  feven  inches  long,  not 
above  — ths  of  an  inch  thick  in  the  Item ; having  the  ex- 
ternal diameter  of  the  ball  very  little  larger  than  that  of 
the 
