AmMi?ch,f896.rm"}      Acetone  and  Acetone-Chloroform.  151 
scribed  apparatus  and  management,  whereby  an  improved  yield  is  to 
.  be  obtained  from  acetates,  and  from  acetates  only,  for  the  apparatus 
and  management  are  not  at  all  applicable  to  the  use  of  acetic  acid, 
and  are  not  used  either  in  form  or  substance. 
At  350°  C.  39*6  pounds  of  absolute  acid  was  fed  iu,  and 
34-8      "       "        "         "      "   received  undecomposed,  leaving 
4-8      "       "        "         "   decomposed,  which  apparently  gave 
87  5  per  cent,  of  the  acetone  required  by  theory. 
At  40cr  C.  41-8  pounds  of  absolute  acid  was  fed  in,  and 
28 -5      "       "        "         "      "   received  undecomposed,  leaving 
13*3      "       "        "         "   decomposed,  which  apparently  gave 
97  per  cent,  of  the  acetone  required  by  theory. 
At  450:  C.  41  "8  pounds  of  absolute  acid  was  fed  in,  and 
13-0     "       "        "         "      "   received  undecomposed,  leaving 
28'8     "       "        "         "   decomposed,  which  apparently  gave 
95  per  cent,  of  the  acetone  required  by  theory. 
At  500 D  C.  43*4  pounds  of  absolute  acid  was  fed  in,  and 
8*8     "       "        "         "      "   received  undecomposed,  leaving 
  • 
34"6     "       "  "  decomposed,  which  apparently  gave 
96*4  per  cent,  of  the  acetone  required  by  theory. 
At  5500  C.  43*4  pounds  of  absolute  acid  was  fed  in,  and 
7 '4     "       "        "         "      "   received  undecomposed,  leaving 
36*0     "       "        "         "   decomposed,  which  apparently  gave 
100  per  cent,  of  the  acetone  required  by  theory. 
Then  a  run  of  twenty-four  hours  was  made  at  the  last  temperature,  5500  C, 
as  a  check  upon  the  previous  results. 
345 '5  pounds  of  absolute  acid  was  fed  in,  and 
69*5     "       "        "         "     <c  received  undecomposed,  leaving 
276*0     "       "        "         "  decomposed,  which  apparently  gave  104  per 
cent,  of  the  acetone  required  by  theory. 
This  last  and  three  other  impossible  results  are,  as  yet,  unexplainable,  but 
they  may  be  reasonably  charged  to  the  uncertainties  in  the  use  of  an  hydro- 
meter and  the  iodoform  process  of  assaying. 
