^ehmaiT^ic?* }      Fat  Decomposition  and  Glycerin.  79 
The  yield  of  tar  on  this  test  was  excessive  and  indicated  that 
some  one  was  not  familiar  with  the  process  of  decomposing  foots  to 
the  advantage  of  the  distillation  plant.  If  the  process  is  properly 
handled,  the  quality  of  the  stock  considered,  the  yield  of  tar  rarely 
exceeds  12  per  cent,  of  the  amount  of  Twitchell  grease  handled. 
Test  on  house  grease : 
Amount  of  grease  30,750  lbs.,  less  moisture  6  per  cent  30,566  lbs. 
Reagent   675  lbs. 
ANALYSIS  OF  GREASE. 
Titre    39.8    per  cent. 
Saponified  value    O.K. 
Fatty  acid   26.8    per  cent. 
Moisture  6    per  cent. 
Unsaponifiable   96  per  cent. 
ANALYSIS  TWITCHELL  FAT 
Fatty  acid    92.39  per  cent. 
Unsaponifiable    1.96  per  cent. 
Moisture    Trace 
ANALYSIS    OIL    BLOWN    OUT    OF  TAR. 
Fatty  acid   3.86  per  cent. 
Unsaponifiable    96.14  per  cent. 
ANALYSIS  DISTTLLED  FAT. 
Titre    40.5    per  cent. 
Moisture  8    per  cent. 
Unsaponifiable   65  per  cent. 
Saponifiable   _   98.55  per  cent. 
Yield : 
Distilled   fat   24,182  lbs.  7740  per  cent. 
Glycerin                                               1,360  lbs.  4.40  per  cent. 
Tar                                                     2,200  lbs.  7      per  cent. 
Unsaponifiable                                       1,172  lbs.  3.80  per  cent. 
Loss                                                   2,327  lbs.  7.40  per  cent. 
100.00  per  cent. 
The  loss  on  handling  house  grease  was  excessively  high  and 
was  due  to  the  large  percentage  of  volatile  or  higher  fatty  acids 
