of  Animals  and  Vegetables.  ar 
gree  and  a half,  fometimes  lefs.  But  this  difference  in 
the  degree  of  cold  between  fleeping  and  waking  is  not  a 
caufe  of  deep,  but  an  effect;  for  many  difeafes  produce  a 
much  greater  degree  of  cold  in  the  animal,  without  giv- 
ing the  lead:  tendency  to  fleep;  therefore  the  inactivity 
of  animals  from  cold  is  different  from  deep.  Behdes,  all 
the  operations  of  perfect  life  are  going  on  in  the  time  of 
natural  deep,  at  lead  in  the  perfect  animals,  fuch  as  di- 
gedion,  fenfations,  8cc.  ; but  none  of  thefe  operations  are 
performed  in  the  latter  tribe. 
To  fee  how  far  the  refult  of  thefe  experiments  upon 
dormice  was  peculiar  to  them,  I repeated  the  fame  expe- 
ments  upon  common  mice.  I procured  two;  one  drong 
and  vigorous,  the  other  weakened  by  fading. 
exp.  xvii.  The  common  atmofphere  being  at  66°,  I 
introduced  the  thermometer  into  the  abdomen  of  the 
drong  moufe : the  ball  beingat  the  diaphragm,  the  quick- 
diver  was  raifed  to  990,  but  at  the  pelvis  only  to  96°|. 
Here  there  was  a real  difference  of  about  90  in  two 
animals  of  the  fame  dze,  in  fome  degree  of  the  fame 
genus,  and  at  the  fame  feafon  of  the  year,  and  the  atmo- 
fphere of  nearly  the  fame  temperature. 
exp.  xviii.  The  fame  moufe  was  put  into  a cold  at- 
xnofphere  of  1 30,  for  an  hour,  and  then  the  thermometer 
was 
