REACTIONS  OF  CHROM.  OF  POTASSA  AND  SULPH.  ACID.  369 
CHROMATE  OF  POTASSA  AND  SULPHURIC  ACID  REAGENTS 
FOR  DIFFERENT  ORGANIC  BODIES. 
Br  Prof.  Eboli,  of  Lima. 
A  number  of  organic  alkalies  and  other  bodies  give,  with  the 
above  tests,  very  characteristic  reactions,  and  may,  according  to 
the  author,  prove  very  useful  in  chemico-legal  examinations. 
One  or  two  milligr.  of  the  substance  are  placed  on  a  watch  glass, 
then  five  or  six  drops  of  diluted  sulphuric  acid  (equal  weights  of 
acid  and  water)  are  dropped  on  it,  and  a  small  piece  of  chromate 
of  potassa  put  in  the  liquid.  Each  of  the  following  changes  of 
color  occupies  several  hours  : — 
Morphia :  nickel  green,  copper  green,  at  last  a  dirty  dark 
green. 
Sulph.  Morphia  :  nickel  green,  copper  green,  dark  yellow. 
Acet.  Morphia  :  nickel  green,  copper  green,  greenish  blue. 
Quinia  :  Scheele's  green,  beautifully  green  yellow,  dark  green. 
Sulph.  Quinia  :  nickel  green,  copper  green,  dirty  yellow. 
Ferro-cyan.  Quinia  :  dirty  green,  leaf  green,  dirty  yellow, 
chocolate  color, 
Cinchonia  :  Scheele's  green,  green  yellow,  dirty  dark  yellow. 
Sulphate  Cinchonia  :  Scheele's  green,  copper  green,  dirty  dark 
yellow. 
Veratria :  dirty  green,  bottle  green,  nickel  green  turbid, 
afterwards  clear,  copper  green  turbid,  at  last  dirty  dark  yellow. 
Atropia :  after  several  minutes  nickel  green,  yellow  green, 
dirty  yellow  green,  and  a  yellowish  precipitate  soluble  in  alcohol. 
Delphinine  :  dirty  green,  clear,  then  turbid  nickel  green,  dirty 
yellowish. 
Lupuline  :  greenish  yellow  turbid,  dirty  green  yellow. 
Codeine:  Scheele's  green,  nickel  green,  copper  green,  dirty 
dark  green. 
Daturia :  copper  green,  greenish  blue. 
Strychnia  :  intensely  violet,  almost  black  near  the  chromate, 
violet  yellow,  after  two  days  blue.  Graham  and  Hoffmann  had 
already  observed  the  violet  reaction. 
Caffeine  and  Naphthaline :  no  reaction. 
Piperine :  greenish  yellow,  nickel  green,  dirty  green. 
Cantharidine  must  be  heated  with  concentrated  sulphuric  acid 
24 
