ON  OTTO  OF  ROSE. 
339 
in  each  case.  The  stearoptene  was  then  pressed  for  some  days 
between  paper,  and  after  exposure  to  the  air  and  drying  over 
oil  of  vitriol,  was  weighed.*  The  fusing  point  was  determined 
in  each  case  by  the  same  thermometer  placed  by  the  side  of  the 
bottle,  and  the  observations  were  confirmed  by  repeated  trials. 
The  English  and  French  samples  experimented  upon,  were 
obtained  direct  from  the  manufacturers,  and  mostly  upon  my 
personal  application.  The  Turkish  sample  No.  7,  was  manufac- 
tured at  Kizanlik,  where  Messrs.  Herman,  from  whom  I  received 
it,  have  an  establishment. 
The  results  I  have  tabulated  as  under  : — 
Table  showing  the  Results  of  a  comparative  Examination  of  Twelve  Samples  of 
Otto  of  Rose. 
No. 
Place  of  Manufacture, 
and 
Manufacturer's  Name. 
Fusing 
Point. 
Percentage 
of 
Stearoptene 
Other  Characters. 
1 
Enqlish. 
London — Messrs.  Allen 
and  Hanburys. 
91°  F. 
68.1 
Of  a  pale  straw  colour,  crystalline,  odor 
weak  and  not  remarkably  fragrant. 
2 
London — Mr.  Whipple, 
at    Messrs.  Barron 
and  Co.'s. 
87°  F. 
50.6 
Resembles  No.  1. 
3 
French. 
Paris — M.  Chardin  Ha- 
dancourt. 
85.5°  F. 
60.8 
A  crystalline  mass,  of  a  pale  green  color  ; 
odor  weak  but  agreeable. 
4 
Grasse  —  M.  Antoine 
Chiris. 
74°  F. 
37.2 
Of  a  straw  color ;  when  congealed,  form- 
ing a  highly  crystalline   mass;  odor 
very  fragrant. 
5 
Grasse — M.  Mero. 
71°  F. 
41.9 
Of  a  brownish-yellow ;   forming,  when 
congealed,  a  transparent  mass  of  platy 
crystals. 
6 
Cannes— MM.  Herman 
Freres. 
70*  F. 
35.0 
Resembles  No.  4. 
7 
Turkish. 
Kizanlik. 
65°  F. 
6.7 
Color  very  pale  yellow;  when  congealed, 
it  constitutes  a  confused  mass  of  platy 
crystals ;  odor  exceedingly  fragrant. 
8 
?      seal  G.  S.  &  Co. 
63°  F. 
7.3 
Col  o   very  pale  yellow ;  a  mass  of  platy 
crystals  when  congealed. 
9 
62°  F. 
6.4 
Resembles  No.  8. 
10 
62°  F. 
6.6 
The  finest  Otto  of  the  London  market. 
In  its  characters  it  resembles  No.  8. 
11 
61°  F. 
4.6 
Resembles  No.  8. 
12 
?      second  quality. 
56°  F. 
4.25 
Wholesale   price  in   London,   in  large 
quantities,  14s.  per  ounce. 
*  I  am  quite  aware  that  this  method  of  determining  the  amount  of  stearoptene 
is  not  free  from  objection,  since,  the  more  abundant  the  elseoptene,  the  less  will 
the  stearoptene  (in  which  it  is  soluble)  be  precipitated  when  the  Otto  is  first 
/  treated  with  alcohol. 
