^^  Dlr^issa      }  Calcium  Ladophosphate. 
607 
oinnamon  and  cloves  each  |  part,  diluted  spirit  and  water,  each  50 
parts,  P.  G. 
Vinum  Bhei,  V.  S.  Tinctura  Rhei  vinosa,  P.  (r.— Rhubarb  10 
parts,  calamus  1  part,  stronger  white  wine,  sufficient  for  100  parts, 
f/;  s. — Rhubarb  8  parts,  bitter  orange  peel  2  parts,  cardamom  1  part, 
•sherry  wine  100  parts,  P.  G. 
CALCIUM  LACTOPHOSPHATE. 
By  R.  Rother. 
When  various  orthophosphates,  in  a  freshly  precipitated  condition, 
are  treated  with  lactic  acid,  a  solution  results  according  to  a  fixed  and 
definite  proportion  of  the  two  components.  The  generated  compounds 
are  rightly  termed  lactophosphates.  But  the  solution  was,  and  is  even 
now,  thought  to  be  nothing  more  than  a  mechanical  effect,  analagous 
to  simple  solutions  in  general,  unattended  by  the  action  of  chepiism. 
When  tricalcic  orthophosphate  and  lactic  acid  react  upon  each  other, 
the  absorption  of  the  former  terminates  in  the  proportion  of  1  m.  of 
it  to  4  ms.  of  lactic  acid.  Such  a  solution  immediately  deposits  a  gran- 
ular precipitate  when  heated.  It  is  not  even  permanent  at  ordinary 
temperatures,  since  it  lets  fall  a  profuse  gelatinous  precipitate  after  the 
lapse  of  a  moderate  time.  The  two  precipitates  are  presumably  not 
the  same,  since  the  latter  is  soluble  and  the  former  insoluble  in  lactic 
acid.  In  this  connection,  the  writer  also  ascertained  that  when  the 
lactic  acid  is  originally  added  in  the  ratio  of  6  ms.  to  J  m.  of  the 
orthophosphate,  the  solution  remains  permanently  intact. 
At  the  time  the  writer  discussed  the  subject  of  lactophosphates  in 
general,  the  conclusion  was  reached  that  in  the  case  of  the  imperma- 
nent calcium  compound  the  redistribution  of  the  affinities  resulted  in 
the  generation  of  acid  calcium  phosphate  and  normal  calcium  lactate, 
thus : 
Ca3(PO,)2-f4HLc=CaH,(PO,)2+2CaLc2. 
On  the  application  of  heat  it  was  assumed  that  insoluble  dicalcic 
phosphate  and  acid  calcium  lactate  was  formed,  as  follows : 
Ca3(POj24-4HLc=2CaHPO,+CaLc2.2HLc. 
In  the  case  of  the  stable  compound,  generated  by  6  ms.  of  acid,  a 
construction  was  deemed  probable  whereby  normal  calcium  lactate  and 
free  orthophosphoric  acid  resulted,  as  follows : 
Ca3(P04)2+6HLc=3(CaLc2)-f2(PO,H3). 
