of  Animals  and  Vegetables.  3 7 
There  was  a very  material  difference  in  the  effedl  be- 
tween thofe  fowls,  the  ferfated  edges,  of  whofe  combs 
I fufpedted  to  have  been  frozen  irf  the  winter  of 
1 7 6{,  for  they  muff  have  dropped  off.  The  only  way 
in  which  I can  account  for  this  difference  is,  that  in  thofe 
fowls  the  parts  were  kept  fo  long  frozen,  that  the  unfro- 
zen or  active  parts  had  time  to  inflame,  and  had  brought 
about  a fepa ration  of  the  frozen  parts,  treating  them 
exa&ly  as  dead,  fimilar  to  a mortified  part;  and  that 
before  they  thawed,  the  feparation  was  fo  far  com- 
pleated  as  to  deprive  them  of  farther  fupport. 
As  it  is  confidently  aflerted,  that  filh  are  often  frozen 
and  come  to  life  again,  and  as  I had  never  fucceeded  in 
any  of  my  experiments  of  this  kind  upon  whole  filh;  I 
made  fome  partial  experiments  upon  this  clafs  of  ani- 
mals, being  led  to  it  by  having  found  a material  differ- 
ence in  my  experiments  upon  whole  individuals  and  only 
parts  of  the  more  perfect  order  of  animals. 
I froze  the  tail  of  a tench  (as  high  as  the  anus)  which 
became  as  hard  as  a board;  when  it  thawed,  that  part 
was  whiter  than  common;  and  when  it  moved,  the 
whole  tail  moved  as  one  piece,  and  the  termination  of  the 
frozen  part  appeared  like  the  joint  on  which  it  moved. 
On  the  fame  day  I froze  the  tails  of  two  gold  filh  till 
they  became  as  folid  as  a piece  of  wood.  They  were  put 
. [ into. 
