TETRABROMIDE  OF  CARBON. 
449 
ASHY  CROWN  CINCHONA  IN  VENEZUELA. 
Dr.  Ernst,  the  President  of  the  Society  of  Natural  and  Phy- 
sical Sciences  of  Caracas,  has  rediscovered  the  Cinchona  cordifo- 
lia,  Mutis,  var.  rotundifolia,  Weddell  ((7.  rotundifolia,  Pavon), 
in  the  neighborhood  of  Caracas,  a  specimen  having  been  col- 
lected in  1829  by  Dr.  Vargas  in  the  same  place. 
In  an  excursion  made  by  Dr.  Ernst,  the  trees  were  found  in 
groups  on  the  slopes  of  Papelon,  Anauco,  Galipan,  etc.,  at  an 
elevation  of  4500  feet  above  the  sea-level.  The  trees  were  cov- 
ered with  lichens  (the  Grajohis  sulcata,  DC,  being  particularly 
noticed),  and  the  largest  of  them  had  a  circumference  of  83 
centimetres.  The  same  tree  is  said  probably  to  occur  in  Ma- 
riches,  from  whence  small  quantities  of  bark  were  collected  for 
exportation  some  time  ago.  The  bark  of  this  tree  is  known  in 
commerce  as  Ashy  Crown  Bark,  one  of  the  Loxa  or  Crown 
Barks,  and  occurs  in  quills.  From  an  analysis  made  by  Senor 
Vicente  Marcano,  a  member  of  the  same  society,  60  grammes  of 
this  bark  yielded  3  decigrammes  of  quinine,  and  4  decigrammes 
of  cinchonine.  The  bark,  however,  was  collected  at  the  wrong 
season. 
From  Port  Cabello  another  bark,  known  as  Quina  Maracaibo, 
is  exported.  This  is  the  produce  of  the  Cinchona  Tucujensis,  a 
tree  growing  only  to  the  height  of  12  to  15  feet,  which  is  found 
in  the  forests  surrounding  the  colony  of  Tovar.  In  the  same 
forests  are  found  Cinchona  (now  Buena)  Henleana  and  Moritzi- 
ana  of  Klotzsch. —  Vargasia :  Boletin  de  la  Sociedad  de  Ciencias 
Fisicasy  Naturales  de  Caracas,  No.  7,  1870, /row  Pharm.  Jour.j 
Lond.,  July  23,  1870. 
TETRABROMIDE  OF  CARBON. 
At  a  recent  meeting  of  the  Chemical  Society,  the  discovery 
of  the  tetrabromide  of  carbon  was  announced  by  Messrs.  Bolas 
and  C.  E.  Groves.  This  compound  is  obtained  by  several  pro- 
cesses :  (1)  by  heating  bisulphide  of  carbon  in  a  sealed  tube 
with  bromide  of  iodine ;  (2)  by  digesting  bromopicrin  (CB3NO2) 
with  bromide  of  iodine  in  a  flask  furnished  with  a  condensing 
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