OBSERVATIONS  UPON  THE  SORGHUM  SACCHARATUM.  Ill 
evaporation,  and  calls  the  difference  the  residue  of  molasses, 
without  any  allowance  for  loss  by  evaporation. 
6th  Experiment,  (Nov.  9th). — This  trial  was  intended  to  have 
been  included  in  the  preceding,  but  a  sudden  change  in  the 
weather,  (ther.  74°)  having  induced  a  change  in  the  working  of 
the  juice  and  its  richness,  Mr.  L.  determined  to  keep  its  results 
separate.    It  produced  good  sugar,  but  in  less  proportion. 
6th  Experiment,  (Nov.  27). — The  weather  having  been  very 
changeable,  warm  Indian  summer,  heavy  rains,  and  ice  two 
inches  thick,  the  mercury  varying  from  16°  to  60p.  To  try  the 
effects  of  these  changes  on  the  cane  j^th  of  an  acre  was  cut,  pro- 
ducing ll1^  gallons  of  juice  only  instead  of  19  or  20  gallons,  as 
before.  The  juice  marked  10°  B.,  and  clarified  without  difficulty, 
yielded  more  scum  but  less  sugar.  This  experiment  proves  that  the 
sorghum  will  withstand  the  vicissitudes  of  the  climate  ^n  a  re- 
markable manner. 
7th  Experiment  was  the  production  of  white  loaf  sugar  from 
inferior  portions  of  the  results  of  the  other  experiments  ;  and  by 
the  old  process  24  lbs.  of  very  indifferent  sugar  refined  in  an  open 
kettle  produced  15  lbs.  of  loaf  sugar,  which  is  a  full  yield  for 
the  quality. 
The  author  acknowledges  the  assistance  of  his  partner,  Mr. 
William  Morris  Davis,  in  the  polariscopic  observations,  and  then 
makes  the  following  observation  in  reference  to  his  experiments : 
"They  are,  I  think,  sufficiently  flattering  in  themselves  to 
warrant  renewed  exertions  on  the  part  of  our  agriculturists,  of 
the  Northern  and  Middle  States  especially,  and  perhaps  those  of 
the  South  also,  in  the  pursuit  of  this  promising  branch  of  indus- 
try, to  the  full  and  profitable  development  of  which  it  is  certainly 
capable,  and  which  it  is  destined  ultimately  to  attain."  In  mak- 
ing a  comparative  estimate,  with  the  products  of  the  cane  in 
Louisiana,  the  author  thinks  that  10  per  cent,  should  be  added 
for  the  inefficiency  of  his  mill,  5  per  cent,  for  the  effect  of  heat, 
and  five  per  cent,  for  footings,  which  would  raise  the  produce  of 
sugar  (by  the  4th  experiment)  to  1466-22  lbs.  per  acre  from  1847 
gallons  of  juice.  Further,  statements  have  appeared  in  the 
papers  of  much  larger  yields  of  juice  per  acre,  which,  if  true, 
will  probably  swell  this  amount  considerably. 
The  following  tabular  statement  of  the  produce  of  an  acre  of 
