128  Ancient  Alum  Well  at  Horrogate.  {^""'Mal'^ssT™' 
alcoholic  constitnent,  which  is  present  apparently  in  not  very  consider- 
able amount,  in  the  form  of  a  benzoic  ether,  much  more  Ylang  oil 
would  be  required. 
Besides  the  benzoic  ether  and  a  supposed  above-mentioned  phenol 
an  aldehyd  or  ketone  is  also  indicated  in  the  Ylang  oil,  in  so  far  as  by 
shaking  the  latter  with  acid  sodium  sulphite  the  formation  of  a  very 
small  amount  of  crystals  was  observed.  That  Gal  did  not  obtain  the 
same  must  remain  unexplained.  Like  the  benzoic  acid,  the  acetic  acid 
is  also  undoubtedly  present  in  the  Cananga  oil  in  the  form  of  a  com- 
pound ether. 
Duboisina. — Mr.  Duquesnel,  a  pharmacist,  has  presented  to  the 
French  Academy  crystallized  specimens  of  the  pure  alkaloid  of 
Duboisia  myoropoides.  Duboisina,  which  had  previously  been  obtained 
only  as  a  syrupy  amorphous  product  of  a  yellow  color,  crystallizes  in 
fine  colorless  needles,  grouped  around  a  central  point;  it  is  much  les& 
soluble  in  water  than  the  amorphous  product,  and  forms  with  sulphuric 
acid  a  neutral  salt,  easily  crystallizable,  deliquescent,  and  possessing 
very  energetic  mydriatic  properties.  The  chemical  study  will  deter^ 
mine  in  what  respects  it  resembles  or  differs  from  atropina,  and  its- 
physiological  study  has  been  undertaken  at  the  laboratory  of  physiology^ 
under  the  direction  of  Dr.  Laborde,  who  will  make  known  the  results^ 
— Jour,  de  Pharm.  et  de  Chirn.,  Jan.,  1881,  p.  39. 
The  Ancient  Alum  Well  at  Harrogate.— R.  Hay  ton  Davis^, 
F.C.S.,  gives  the  following  constituents  in  grains  in  one  gallon  : 
Fe 
47-59 
Ferric  sulphate, 
.  78-76> 
Al 
14-24 
Ferrous      "  . 
69-33. 
Ca 
16-74 
Aluminium  sulphate, 
.  89-47 
Mg 
11-47 
Calcium  " 
56-91 
K 
1-40 
Magnesium  '* 
.  57-38. 
Na 
13-36 
Potassium  " 
3-14 
NH, 
0-59 
Ammonium 
.  2-19' 
SO, 
265-44 
Sodium  chloride. 
33-96 
CI 
20-60 
Silica, 
.  3-27 
SiO 
3-27 
394-70 
394-41 
Spec,  grav.,  1005-43.  Total  residue  dried  at  360  to  380°,  397-25. 
— Jour.  Chem,  Soc,  1881,  Jan»,  p.  20. 
