108      OBSERVATIONS  UPON  THE  SORGHUM  SACCHARATUM. 
fine  bone  black  and  three  eggs,  and  placed  it  over  a  slow  fire  ;  at 
215°  Fahr.  took  off  a  very  dense  green  scum ;  when  at  162°  F. 
it  marked  1\  Beaumd. 
A  second  parcel  of  juice  from  this  grinding  (8  J  gallons)  was 
treated  in  the  same  manner?  and  set  aside,  both  having  been 
boiled  down  to  22°  B. 
Oct.  14,  (temp.  54°  to  70°)  cut  and  ground  50  feet;  81  canes 
produced  7  J  galls,  juice,  10°  B.,  which  was  heated  as  above, 
except  that  the  eggs  were  omitted. 
Oct.  15,  (temp.  50°  to  70°)  cut  and  ground  50  feet-,  produced 
8J-  galls,  juice,  weighing  10°  B. 
Oct.  16,  (temp.  46°  to  60°)  cut  and  ground  50  feet,  86  canes, 
8f  galls.,  10°  B. 
The  whole  of  the  foregoing  parcels  were  at  this  stage  of  the 
process  concentrated  to  22°  B.,  and  set  aside,  until  I  had  com- 
pleted the  series,  on  the  21st  of  Oct. ;  they  were  then  collected 
together,  and  again  clarified  with  eggs,  and  a  second  scum  taken 
off;  they  were  then  placed  over  the  fire,  and  when  at  the  tem- 
perature of  225°  F.  clear  lime  water,  in  small  quantities,  was 
added,  to  coagulate  the  vegetable  albumen,  which  is  not  disen- 
gaged at  a  lower  temperature,  but  which  is  then  observed  as  a 
whitish.scum,  very  tenacious  and  glutinous,  and  is  very  detri- 
mental to  crystallization.  After  the  various  delays,  heatings 
and  reheatings,  consequent  on  my  limited  means  of  working,  (the 
great  disadvantage  of  which,  those  acquainted  with  the  subject 
only  can  appreciate,)  I  commenced  filtering  the  whole,  but  found 
it  so  ropy  and  glutinous  that  it  would  not  pass  through ;  diluted 
it  to  10°  B.,  when  it  came  through  tolerably  bright ;  then  passed 
it  through  5  feet  of  animal  black ;  it  parted  with  its  coloring 
matter  very  freely. 
Oct.  22d.  Divided  the  product  into  three  parts,  and  boiled  it 
as  follows  : 
1st  part  to  230°  F. — This  stood  an  hour  without  crystallizing, 
found  it  too  low,  though  the  thumb  and  finger  proof  indicated 
otherwise. 
2nd  part  to  246°  F  which  was  added  to  the  first,  and  in  a 
few  minutes  crystals  began  to  appear. 
3rd  part  to  238°  F. — being  the  mean  of  the  other  two.  On 
