358  Analysis  of  Brandy  and  Alcohol.  {AmjJu^isP9?arm' 
There  is  an  absolute  identity  in  the  results  between  the  specimen 
of  A.ferox,  obtained  from  Mr.  Wood,  and  the  large  number  of  comr 
mercial  specimens  of  Natal  aloes  that  had  been  previously  examined. 
In  comparison  with  the  aloes  obtained  from  plants  grown  at  Kew,  I 
find  that  it  resembles  most  closely  in  its  reactions  those  obtained 
from  A.  succotrina.  The  only  reaction  in  which  they  do  not  agree 
is  the  bromine  test,  but  this  reaction  is  not  considered  as  a  proof 
that  the  commercial  Natal  aloes  are  not  derived  from  this  species, 
but  that  it  is  possible  that  the  property  might  be  lost  on  keeping 
or  by  fermentation.  The  reactions  of  the  aloes  from  the  plant  sup- 
posed to  be  A.  platylepis  are  similar  to  those  of  commercial  Cape 
aloes. 
The  results  are  recorded  in  the  following  table : 
Table  of  Results. 
Specimens. 
HN03. 
H0SO4  and 
vapor  of 
HNO* 
Cripps  and 
Dymond. 
C  and  D., 
with 
XH4HO. 
Bromine 
Test. 
Fe2Cl6. 
Natal    aloes,    from  "A. 
Permanent 
Blue. 
Deep 
Intense 
No  effect. 
Olive-green. 
ferox"  J.  M.  Wood.   .  . 
crimson. 
crimson. 
brown-red. 
A.  ferox,  grown  at  Kew,  . 
Evanescent, 
crimson. 
Green. 
Pale  yellow. 
Red. 
Violet. 
Olive-green. 
Commercial  Natal  aloes,  . 
Permanent 
crimson. 
Blue. 
Deep 
crimson. 
Intense 
brown-red. 
No  effect. 
Olive-green. 
A.  succotrina,  grown  at 
Permanent 
Deep  blue. 
Crimson. 
Intense 
Deep  pur- 
Olive-green. 
Kew  
crimson. 
brown-red. 
plish  red. 
Nil. 
Aloes  prepared  from  A. 
Green  after 
Nil. 
Orange-red. 
Pale  claret. 
Olive-green. 
platylepis,   grown  near 
Port  Elizabeth  
standing  a 
few  minutes. 
Juice  of  A.  platylepis,  .  .  . 
Beautiful 
emer.-green. 
Nil. 
Orange-red. 
Pale  claret. 
Nil. 
Olive-green. 
— Phar.  Jonr.  and  Trans.,  April  4,  189 1,  p.  899. 
ANALYSIS  OF  BRANDY  AND  ALCOHOL.1 
By  E.  Mohler. 
Ethereal  salts. — 100  cc.  of  the  distilled  alcohol  is  boiled  for  an 
hour  with  20  cc.  of  decinormal  potash  in  a  reflux  apparatus ;  the 
excess  of  potash  is  determined,  and  the  rest  is  calculated  to  ethyl 
acetate. 
Aldehydes  are  estimated  by  means  of  the  coloration  with  rosanL* 
line  bisulphite,  the  intensity  of  the  color  of  the  solution  examined 
being  compared,  by  means  of  a  Duboscq colorimeter,  with  the  color- 
ation given  by  a  solution  of  aldehyde  of  known  strength  ;  10  cc.  of 
1  Compt.  rend.,  112,  53-55  ;  Jour.  Chem.  Soc,  1891,  503. 
