16       EXTRACTUM  COLOCYNTHIDIS  ALCOHOLICUM,  U.  S.  P. 
"  My  dear  Sir, — In  looking  over  my  note  book,  at  your  request, 
back  to  1857,  I  find  only  two  records  of  ascertained  proportion 
of  seed  and  pulp  in  colocynth.  In  one  the  pulp  weighed  26*03 
per  cent.,  and  in  the  other  26'23  per  cent.  I  have  long  since 
ceased  to  ascertain  the  proportion  between  seed  and  pulp,  and 
simply  grind  the  whole  up  in  a  mill  which  will  be  sure  not  to 
break  the  seed,  and  then  percolate  the  whole  together.  The 
results  of  these  percolations  are  as  follows  : 
I860.  March    100  lb.    colocynth,  yield  14  ft>.  8  oz.  simp.  ext.  or  14-5    p.  ct. 
Oct. 
280 
n 
it 
it 
40 
a 
8 
a 
n 
a 
14-46  " 
1861.  Jan. 
45 
6 
14-  u 
July 
300 
a 
a 
tt 
48 
it 
6 
it 
a 
it 
16-2  " 
Sept. 
544 
it 
8 
tt 
it 
85 
tt 
6 
tt 
it 
tt 
15-7  « 
Dec. 
197 
a 
8 
a 
it 
31 
ct 
0 
tt 
tt 
a 
15-7 
1862.  Jan. 
315 
it 
3 
tt 
it 
50 
a 
8 
it 
it 
tt 
16-03  " 
April 
250 
tt 
a 
it 
34 
it 
8 
u 
it 
a 
13-8  " 
May 
224 
it 
6 
it 
ti 
30 
a 
8 
ti 
a 
ti 
13-7  " 
June 
262 
tt 
a 
it 
38 
tt 
tt 
it 
a 
14-5  " 
July 
246 
a 
u 
ct 
36 
tt 
tt 
tt 
it 
14-6  " 
Aug. 
264 
a 
8 
tt 
it 
35 
tt 
10 
tt 
tt 
it 
13-5  " 
1863.  Feb. 
236 
a 
9 
u 
cc 
33 
it 
12 
tt 
tt 
a 
14-3  « 
April 
506 
a 
11 
ct 
66 
tt 
14 
it 
a 
a 
13-1  « 
July 
605 
a 
13 
It 
tt 
90 
it 
12 
it 
it 
tt 
15-*  " 
Nov. 
643 
it 
ti 
It 
93 
it 
4 
it 
a 
tt 
14-46  " 
1865.  March 
925 
it 
it 
It 
125 
ti 
8 
n 
n 
a 
13-5  " 
July 
1080 
tt 
it 
it 
122 
a 
it 
it 
tt 
11-3  " 
Sept. 
2686 
tt 
tt 
It 
334 
it 
a 
it 
it 
12-4  " 
Dec. 
240 
tt 
it 
ct 
32 
it 
2 
tt 
tt 
it 
13-4  " 
995  1ft). 
7 
1349  lb.  4£ 
13-56*  p.  ct. 
"With  the  exception  of  the  last  four  parcels  all  this  colocynth 
was  selected  and  purchased  by  me.  The  last  four  parcels,  4931 
lbs.,  were  purchased  by  the  U.  S.  Government,  and  the  simple 
extract  was  made  from  them  for  the  Government.  All  my 
purchases  were  of  good  fair  quality  and  only  varied  as  the 
market  for  good  quality  varied.  That  bought  by  the  Govern- 
ment was  not  so  good,  and  a  portion  of  some  parcels  being 
damaged  was  separated  and  thrown  away.  This  does  not 
enter  into  the  weights  as  given.  If  the  whole  weight  had  been 
taken  the  yield  would  have  been  lower  yet.  I  cannot  recon- 
cile your  results  with  the  above  table.    You  will  have  to  try 
*  Nearly. 
