584 
Iodine  in  Marine  Products. 
f  Am.  Jour.  Pharm. 
\       Nov.,  1884. 
Fine  Turkish.  Honeycomb. 
Water                            19'40  19-40 
Organic  matter               69'39  50*24 
Ash  soluble  in  water          2*21 1   •      „  -f  3*70  )  ni 
•  .  .      .  , ,   .        ,         n  r\r\  i  Ash,  11*21  \  > 30*26 
Ash  insoluble  m  water...    9*00  J        '  I  26*66  f 
100*00  100*00 
Iodine                       .     -200  =4-48  lbs.  *054  =1*2096 
to  ton.  lbs.  to  ton. 
Iodine  on  sol.  salts...     9*050  1*460 
Per  ton  of  salts           202*7      lbs.  32*7  lbs. 
On  the  total  ash            0*1779  per  cent.  1*7841  per  cent. 
Per  ton  of  ash               4        lbs.  39  96  lbs. 
The  salts  contained  only  a  trace  of  potash,  as  free  alkali,  chloride  of 
sodium  and  sulphate  of  lime.  Turkey  sponge  is  therefore  very  rich  in 
iodine,  but  its  value  per  lb.  is  unfortunately  about  twelve  times  that  of 
iodine.  The  insoluble  ash  is  principally  sand.  I  hope  to  give  some 
further  details  of  this  ash  later  on.  The  sponge  was  carbonized  and 
the  salts  extracted  from  the  charcoal.  I  have  shown  in  a  former  paper, 
that  the  iodine  is  rapidly  volatilized  when  an  organic  compound  con- 
taining it  is  burnt  to  complete  ash,  especially  in  the  presence  of  silica. 
I  will  only  add  that  it  will  afford  me  much  pleasure  to  examine  any 
home  grown  sponges  or  other  marine  products  that  may  assist  our 
knowledge  of  the  distribution  of  iodine,  if  any  of  our  members  who 
reside  near  the  sea  will  favor  me  with  samples  of  not  less  than  5,000 
grams. — Phar.  Jour,  and  Trans.,  Sept.  20,  1884,  p.  233. 
HyOSCine. — Ladenburg  has  shown  that  on  boiling  hyoscine  with 
alkalis  or  baryta,  it  is  resolved  into  tropic  acid  and  pseudotropine,  a 
base  isomeric  with  tropine.  Both  products  have  been  further  examined 
by  A.  Ladenburg  and  C.  F.  Roth  (Ber.,  17, 151-152).  Pseudotropine 
crystallizes  in  rhombohedrons,  melts  at  106°,  and  boils  at  241-243° 
(tropine  crystallizes  in  the  rhombic  system,  and  melts  at  62°) ;  it  is 
less  hygroscopic  than  tropine,  is  very  readily  soluble  in  water,  readily 
soluble  in  chloroform,  sparingly  in  ether.  Proof  of  the  identity  of  the 
tropic  acid  from  hyoscine  with  that  from  other  sources  was  obtained  by 
its  conversion  into  atropine  when  treated  with  tropine  and  hydrochloric 
acid.— Jour.  Chem.  Soc. 
