FACTS  AND  THEORIES  OF  FERMENTATION.  4dl 
of  vibriones  and  covered  with  a  thick  mould.  The  experiment 
flask  a,  remained  perfectly  clear  and  with  no  appearance  of  mould 
or  fermentation.  The  air  was  drawn  constantly  through  the 
apparatus,  in  the  manner  described,  from  the  30th  of  November 
until  the  23d  of  December.  It  was  then  allowed  to  remain  at 
rest  until  the  25th  of  January,  1855,  no  appearance  of  decompo- 
sition having  occurred  in  the  flask  a  ;  the  washing  and  drying 
tubes  e  and  d  were  disconnected,  so  that  the  air  entered  from 
the  atmosphere  immediately  into  the  filter  tube ;  this  was  done 
to  make  certain  that  the  effects  produced  were  not  caused  by  the 
water  or  by  the  chloride  of  calcium.  The  air  was  now  again 
drawn  through  as  before,  on  alternate  days,  until  February  26th, 
when  the  operation  was  concluded.  On  examining  the  water  in 
the  washing  vessel  e,  it  was  found  to  be  reduced  by  evaporation 
to  about  one  drachm  ;  it  was  perfectly  colorless  and  transparent; 
suspended  in  it,  however,  there  was  a  flocculent  mass  of  the  size 
of  a  pea,  colorless  and  resembling  very  fine  raw  cotton  ;  it  was 
possessed  of  great  tenacity,  although  of  the  most  delicate  struc- 
ture.   Under  the  microscope,  the  liquid  was  found  to  be  filled 
