AmMaySarm'}      Kink  Acid  in  Cranberry  Leaves,  241 
water  if  liable  to  do  so.  It  is  a  well-known  fact,  certainly,  that  cal- 
cium kinate  crystals  are  efflorescent  in  dry  air,  as  also  that  they  are 
deprived  of  all  their  water — after  having  been  exposed — for  a  suffi- 
cient time  to  a  heat  of  1200  C,  and,  moreover,  that  a  heat  even 
of  2000  C.  will  not  decompose  them.  Considering  this,  0  6132 
grm.  of  the  crystals  to  be  examined  were  dried  at  1500  C,  at 
which  temperature  they  lost  0-1091  grm.,  representing  the  amount 
of  water  present,  and  left  a  residue  of  0-5041  grm.,  the  anhydrous 
calcium  salt,  without  apparent  change;  this  residue,  ignited  until 
perfectly  white  again,  and  then  repeatedly  and  carefully  heated 
with  some  water  and  ammonium  carbonate,  left  01 191  grm. 
of  calcium  carbonate,  corresponding  to  0-0476  grm.  of  cal- 
cium. According  to  the  above  statement,  the  quantity  of 
water  of  crystallization  present  amounted  to  17-808  per  cent., 
and  that  of  calcium  in  the  anhydrous  salt  to  9-451  per  cent.,  while 
it  is  known  that  calcium  kinate  contains  29  900  per  cent,  water  and 
the  anhydrous  salt  9-479  per  cent,  calcium.  The  analyzed  salt 
lacks,  therefore,  considerably  in  regard  to  the  amount  of  water,' 
viz  :  12  082  per  cent.,  which  loss  may  be  easily  explained  by  its  hav- 
ing been  exposed  for  the  mentioned  long  time  to  dry  air — and  is, 
anyhow,  in  this  case — of  no  importance,  if  it  should  not  be 
claimed  as  a  proof  that  the  calcium  salt  in  question  is  also  pos- 
sessed, like  the  kinate,  of  the  property  of  efflorescing  in  dry  air. 
In  regard  to  the  amount  of  calcium,  however,  in  the  anhydrous 
salt,  it  is  of  interest  to  note  that  there  is  hardly  a  difference  existing 
between  the  quantity  found  in  it  and  that  calculated  from  pure  cal- 
cium kinate,  which  difference,  being  but  0  028  per  cent.,  is  evidently 
not  sufficient  to  raise  any  doubts  as  to  the  identity  of  that  salt  with 
calcium  kinate. 
Although,  after  having  arrived  at  this  point,  a  further  test 
did  not  seem  to  be  of  value  any  more  or  necessary  ;  it  was 
resolved  to  continue  the  examination,  in  order  to  add  to  the 
chain  of  proofs  the  last  link,  if  such  one  might  possibly  be  thought 
by  somebody  to  be  yet  missing.  For  this  purpose  I  prepared  from 
pure  kinic  acid  some  calcium  kinate,  with  which  I  then  made  the 
following  test,  comparing  the  same  carefully  with  reactions  obtained 
under  the  same  conditions,  with  an  equal  quantity  of  the  calcium 
salt  from  Vaccinium  macrocarpon,  Aiton.  The  pure  calcium  kinate 
gave,  heated  in  a  tube,  much  water,  then  melted  by  increased  heat, 
