30  Mr.  hunter  on  the  Heat,  See. 
exp.  xli.  A frefh  egg,  and  one  which  had  been 
frozen  and  thawed,  were  put  into  the  cold  mixture  at 
f 5°;  the  thawed  one  foon  came  to  3 a®,  and  began  to 
fwell  and  congeal;  the  frefh  one  funk  to  29°^,  and  in 
twenty-five  minutes  after  the  dead  one,  it  rofe  to  3 a°, 
and  began  to  fwell  and  freeze. 
The  refult  of  this  experiment  upon  the  frefh  egg  was 
fimilar  to  the  above  experiments  upon  the  frog,  eel, 
fnail,  See.  where  life  allowed  the  heat  to  be  diminifhed 
a°  or  30  below  the  freezing  point,  and  then  refilled  all 
further  decreafe;  but  the  powers  of  life  were  expended 
by  this  exertion,  and  then  the  parts  froze  like  any  other 
dead  animal  matter. 
From  thefe  experiments  in  general  it  muft  appear, 
that  a frefh  egg  has  the  power  of  refilling  heat,  cold, 
and  putrefaction,  equal  to  many  of  the  more  imperfeCt 
animals;  and  it  is  more  than  poflible,  that  this  power 
arifes  from  the  fame  principle  in  both. 
From  home  of  thefe  experiments  it  appears,  that  the 
more  imperfeCl  animals  are  capable  of  having  their  heat 
and  cold  varied  very  confiderably,  not  according  to  the 
extent  of  the  heat  or  cold  of  the  furrounding  medium 
in  which  they  can  live,  but  according  to  the  degree  of 
cold  which  is  capable  of  altering  the  parts  in  a dead 
flate,  below  which  the  living  power  will  not  go  far; 
for 
