396 
DENSITY  OF  SOLUTIONS  OF  CHLORIDE  OF  ZINC. 
those  just  mentioned.  It  not  only  effectually  destroys  the  foul 
odors  arising  from  suppurations,  and  from  putrefying  and  fecal 
matters,  but  it  acts  likewise  on  many  other  odorous  substances. 
I  will  cite  a  curious  fact  in  confirmation  of  this.  Having  one 
day  inadvertently  imbued  my  hands  with  a  concentrated  solution 
of  carbolic  acid,  I  could  not  rid  myself  of  the  penetrating  and 
offensive  smell.  Repeated  washings  with  soap,  followed  by  appli- 
cations of  vinegar,  chloride  of  lime  and  ammonia,  failed  to  remove 
the  odor.  Being  on  the  point  of  attending  a  consultation  to 
which  I  was  very  reluctant  to  carry  so  nasty  a  smell,  I  was  in 
despair.  The  idea  occurred  to  dip  my  fingers  in  permanganate 
solution.  The  first  application  caused  a  notable  diminution  of 
the  carbolic  odor;  after  the  third  it  had  entirely  gone." — Med. 
Press  and  Circular,  June  10,  1868. 
Purification  of  tannin.— -M.  Heintz  [Zeitschrift  fur  Chemie) 
purifies  commercial  tannic  acid  by  dissolving  it  in  water,  and 
agitating  it  rapidly  with  ether  that  has  been  well  purified.  The 
decanted  solution  is  then  filtered,  the  ether  evaporated,  and  the 
tannin  obtained  free  from  odor  or  evaporation. 
Cinchona  in  Jamaica. — According  to  the  Standard  (in  Med. 
Press  and  Circ,  July  22,)  we  learn  that  the  experiment  with  the 
culture  of  Cinchona  in  Jamaica  is  in  a  fair  way  of  success. 
Commenced  in  1866  there  were  800  plants  growing  in  1867,  and 
at  the  present  time  25000  plants  are  in  vigorous  growth.  The 
sites  chosen  are  from  3700  to  5200  feet  elevation  on  the  Blue 
Mountain  range,  and  the  whole  experiment  is  under  the  direction 
of  Mr.  Robert  Thompson,  who  believes  that  this  culture  will 
prove  to  be  "highly  remunerative." 
ON  THE  RELATION  OF  PERCENTAGE  TO  DENSITY  IN 
SOLUTIONS  OF  CHLORIDE  OF  ZtNC. 
By  Charles  Bullock. 
Amount  of  Fused  Chloride  of  Zinc  contained  in  100  parts 
of  solution  at  different  densities. 
The  fused  chloride  was  dissolved  in  distilled  water  with  ad- 
dition of  sufficient  hydrochloric  acid  to  dissolve  the  oxychlo- 
ride  formed. 
