394  Gleanings  from  the  European  Journals.  { AMsept"i,  mT*' 
14.  A  similar  behavior  have  the  carbonates  of  the  alkalies. 
15.  Bicarbonates  of  the  alkalies  have  an  analogous  behavior. 
16.  Tincture  of  galls  produces  in  solutions  of  saponin  a  whitish 
flocculent  turbidity,  which  disappears  on  boiling. 
17.  A  similar  whitish  turbidity  is  obtained  with  ferridcyanide  and 
with  sulphocyanide  of  potassium. 
18.  Ferrocyanide  of  potassium  does  not  alter  the  solution  of  sapo- 
nin. 
19.  Iodide  of  potassium, 
20.  Bichromate  of  potassium,  and 
21.  Picric  acid  produce  no  change  in  solutions  of  saponin. 
22.  Hydrate  of  barium  yields  a  white  precipitate,  which  is  insolu- 
ble on  boiling,  and  cakes  together. 
23.  Subacetate  of  lead  causes  a  white  voluminous  precipitate,  cak- 
ing on  boiling. 
24.  Saponin  separates  mere  traces  of  suboxide  of  copper  from 
alkaline  copper  solution  ;  pure  sulphate  of  copper  is  not  affected. 
25.  Acetate  of  zinc,  \    produce  in  solutions  of  saponin  white  pre- 
26.  Ferric  chloride,   V  cipitates,  which  do  not  disappear  on  boil- 
27.  Arsenious  acid,  )  ing. 
28.  On  boiling  saponin  with  solution  of  nitrate  of  silver,  the  latter 
•is  slowly  reduced. 
29.  Chloride  of  gold,  and 
30.  Corrosive  sublimate  give  no  reaction  with  saponin.  M. 
GLEANINGS  FROM  THE  EUROPEAN  JOURNALS. 
By  the  Editor. 
On  the  Color  of  Tincture  of  Litmus  in  Yellow  Sodium  Light. — L. 
D'Henry  has  observed  that  the  yellow-colored  light  produced  by  a 
Bunsen  burner  with  table  salt,  causes  red  tincture  of  litmus  to  ap- 
pear colorless,  while  the  blue  litmus  tincture  has  a  black  and  ink-like 
appearance.  This  difference  in  the  color  is  so  marked  that  he  con- 
siders it  by  far  easier  for  the  chemist  to  effect  exact  neutralisations 
at  night  or  in  a  dark  chamber,  than  by  daylight.  Even  dark-colored 
syrups  may  thus  be  neutralized,  without  diluting  them,  the  point  of 
saturation  being  very  readily  observed,  notwithstanding  the  coloration 
of  the  liquid.— Pharm.  Cent.  Halle,  1873,  No.  27,  from  Polyt. 
JSfotizbl. 
