26 
Mr-,  hunter  on  the  Heat,  See. 
The  frog  being,  in  its  ftnidture,  more  fimilar  to  the 
viper  than  to  either  fowl  or  filh,  I made  the  following 
experiments  on  that  animal. 
exp.  xxx.  I introduced  the  ball  of  the  thermometer 
into  its  ftomach,  and  the  quicklilver  flood  at  440.  I then 
put  it  into  a cold  mixture,  and  the  quicklilver  funk  to 
310;  the  animal  appeared  almoft  dead,  but  recovered 
very  foon : beyond  this  point  it  was  not  poffible  to  leffen 
the  heat,  without  deltroying  the  animal.  But  its  decreafe 
of  heat  was  quicker  than  in  the  viper,  although  the 
mixture  was  nearly  the  fame. 
The  next  order  of  animals  were  fifh. 
exp.  xxxi.  I afeertained  the  heat  of  water  in  a pond, 
where  there  were  carp,  and  found  it  65°!.  I then  took 
a carp  out  of  the  fame  water,  and  introduced  the  ther- 
mometer into  the  ftomach ; the  quicklilver  rofe  to  69°; 
fo  that  the  difference  between  the  water  and  the  filh  was 
only  3°f 
exp.  xxxii.  In  an  eel,  the  heat  in  the  ftomach,  which 
at  firft  was  at  370,  funk,  after  it  had  been  fome  time 
in  the  cold  mixture,  to  310.  The  animal  at  that  time 
appeared  dead,  but  was  alive  the  next  day. 
exp.  xxxiii.  In  a fnail,  whofe  heat  was  at  440,  it 
funk,  after  it  had  been  put  into  the  cold  mixture,  to  31% 
and  then  the  animal  froze. 
4 
EXP. 
