of  Animals  and  Vegetables . 1 5 
place  through  the  whole  body,  as  in  this  cafe  a living 
man  fliould  always  be  of  the  fame  degree  of  heat  with 
the  atmofphere  in  which  he  lives.  The  man  not  choofing 
to  be  cooled  lower  than  530  or  54°,  put  it  out  of  my 
power  to  fee  if  the  powers  of  generating  heat  were 
exerted  in  a higher  degree,  when  the  heat  was  brought 
fo  low  as  to  threaten  deftrudtion ; but  from  fome  experi- 
ments on  mice,  which  will  be  related  hereafter,  it  will 
appear,  that  the  animal  powers  are  called  upon  to  exert 
themfelves  in  this,  when  necelfary. 
From  the  experiments  related  I found,-  that  parts  of 
an  animal  were  capable  of  becoming  much  colder  than 
the  common  or  natural  heat:  I therefore  made  farther 
experiments,  with  a view  to  fee  whether  the  fame  parts 
were  capable  of  becoming  much  hotter  than  the  ftandard. 
heat  of  animals.  The  experiments  were  made  in  the. 
fame  manner  as  the  former,  only  the  water  was  now 
hotter  than  the  natural  heat  of  the  animal. 
exp.  v.  The  natural  heat  of  the  parts  being  92%  they 
were  now  immerfed  in  water  heated  to  11 30  for  two  mi- 
nutes,and  the  thermometer  being  introduced  as  before,, 
the  quickfilver  rofe  to  100^.  This  experiment  I alfo  re- 
peated feveral  times,  but  could  not  raife  the  heat  of  the 
c 
penis  beyond  ioo°f:  this  was  probably  owing  to  the. 
perfon  not  being  able  at  this  time  to  bear  the  application’ 
of  water  warmer  than  1 1 30.  As  thefe  were  only  Angle 
expe— 
