I 
122  ON  THE  MEDICINAL  HYPOPHOSPHITES. 
liquid  has  passed  add  distilled  water  carefully,  till  it  measures 
ten  fluid  ounces,  and  evaporate  this  to  81  fluid  ounces. 
The  solution  thus  prepared  contains  about  ten  per  cent  of 
terhydrated  hypophosphorous  acid  (HO-}-2HO,PO)  a  tea-spoon- 
ful representing  6  grains  of  the  acid,  which  contains  2J  grains 
of  phosphorus.  The  dose  of  this  acid  solution  will  probably 
vary  from  ten  minims  to  a  tea-spoonful. 
It  is  proposed  to  give  several  forms  in  which  the  hypophos- 
phites  may  be  conveniently  administered,  and  a  few  hints  to 
the  physician  in  reference  to  prescribing  them. 
The  soluble  salts  of  mercury  and  silver  are  reduced  by  con- 
tact with  the  hypophosphites.  All  soluble  sulphates  and  car- 
bonates are  incompatible  with  the  lime  salt,  and  should  not  be 
associated  with  it  in  prescriptions,  if  phosphate  of  lime  is  indi- 
cated in  the  case.  The  iron  salt  when  dissolved  by  excess  of 
acid,  is  colored  black  by  gallotannic  acid  and  drugs  containing  it, 
but  is  not  blackened  by  the  tannin  of  cinchona,  catechu  and 
krameria ;  hence  any  preparation  containing  it  may  be  associated 
with  Peruvian  bark.  The  hypophosphites  of  soda,  potassa  and 
ammonia,  are  more  or  less  deliquescent,  and  when  prescribed  in 
powder  it  should  be  with  proper  precautions  to  avoid  moisture, 
as  by  association  with  a  considerable  excess  of  sugar  of  milk. 
The  lime  salt  may  be  mixed  with  either  this  sugar  or  ordinary 
sugar.  None  of  these  salts  are  soluble  in  cod-liver  oil ;  and  if 
given  with  it,  they  should  be  dissolved  in  syrup,  and  mixed  by 
agitation.  Where  lactin  and  glycerin  are  indicated  in  the 
treatment  of  phthisis  or  dyspepsia,  any  of  these  salts  may  be 
very  elegantly  associated  in  the  form  of  syrup. 
Syrup  of  Hypophosphite  of  Lime, 
Take  of  Hypophosphite  of  lime,  an  ounce. 
Water,  nine  and  a  half  fluid  ounces. 
White  sugar,  twelve  ounces. 
Fluid  extract  of  vanilla,  half  a  fluid  ounce. 
Dissolve  the  salt  in  the  water,  filter,  add  the  sugar,  dissolve  by 
aid  of  heat  and  add  the  vanilla.    The  dose  is  from  a  tea-spoon- 
ful (3|  grs.)  to  a  table-spoonful  (14  grs.),  according  to  the  circum- 
stances of  the  case,  three  times  a  day. 
Compound  Syrup  of  Hypophosphites. — The  following  formula 
