Am'june:S89arm"}    Iodine  Absorption  of  Essential  Oils,  305 
Amount  taken,  0*1277  gram. 
Hyposulphite  solution  required  41  '75  cc. 
Strength  of  hyposulphite  solution,  100  cc.=l*3034  iodine. 
Blank  experiment  (1),  20  cc.  "  Hiibl "  (double  strength)  required 
70*55  cc.  hypo. 
Blank  experiment  (2),  20  cc.  "  Hiibl "  (double  strength)  required 
70*65  cc.  hypo. 
Mean  of  the  two  blank  experiments,  70 '6  cc. 
70*6 — 41,75=28'85  cc.,  the  equivalent  of  "  absorbed "  iodine; 
1-3034X28-85X100 
then  294-46 
100X-1277  —*<>±™ 
As  examples  of  the  agreement  between  determinations  of  the  same 
oil  I  give  the  amounts  of  oil  used,  and  the  absorption  equivalent 
found,  in  the  individual  instances  of  half  a  dozen  oils  for  which  mean 
results  are  given  in  the  table. 
Absorption. 
Sample.  Per  cent.  Mean. 
3.  Aniseed  oil  (a)    -0556  188-3 
(i)    '0573  189-2 
(cj    *1536      191-8  189*7 
4.  Bergamot  (a)    -0475  274'9 
(b)    -0489      277-4  276'1 
5.  Chamomile  (a)    '1014  68'18 
(b)    -0947        68-04  68-1 
6.  "  (a)    -0957  71*8 
(b)    '0960        72-4  72'I 
7.  "  (a)    -216  66-5 
(6)    -1415        64-5  65-5- 
8.  Caraway  .(a)    '0443  254"2 
(b)    -0433      255-6  254"9 
I  venture  to  direct  attention  to  some  points  which  appear  to  have- 
interest,  and  to  draw  such  conclusions  as  the  work  so  far  done  seems 
to  me  to  warrant. 
I  may  say  that  I  feel  the  utmost  confidence  in  the  genuineness  of 
those  oils  indicated  as  obtained  from  the  English  distiller.  In  almost 
all  cases  the  manufacturer  has  placed  these  at  my  disposal  specially 
for  purpose  of  examination,  and  the  agreement  between  these  oils  is 
closer  than  I  should  have  expected  from  a  consideration  of  the  com- 
plex nature  of  essential  oils  generally.  The  samples  of  oil  of  chamo- 
mile, clove,  cubebs,  peppermint  and  sandal-wood  well  illustrate  this, 
agreement. 
