3T0 
SYRUP  0¥  PHOSPHATE  OE  IRON  AND  AMMONIA. 
3. — This  absorption  takes  place  without  causing  any  immedi- 
ate loss  of  caloric  from  the  human  body. 
W  4. — The  color  of  the  dre3s  has  a  great  influence  on  the  ab- 
sorption of  solar  heat,  and  a  modification  of  the  external  sur- 
face is  sufficient  to  give  all  the  advantages  which  white  fabrics 
present  in  hot  climates  whatever  be  the  nature  of  the  material 
itself. — London  Chemist,  from  Comptes  Mendus,  Dec,  1857. 
FORMULA  FOR  MAKING  A  SYRUP  OF  PHOSPHATE  OF  IRON 
AND  AMMONIA. 
By  Joseph  Roberts. 
Read  before  the  College,  March  4th,  1858. 
Take  of  Sulphate  of  Iron,       -  -        278  grains. 
Phosphate  of  Soda,        -       -     359  « 
Glacial  Phosphoric  Acid,  -        896  « 
Liquor  Amnionic,          -  q.  s. 
Sugar,       -  5|  ounces. 
Water,  -       -       -       -  q.  s. 
Dissolve  the  phosphate  of  soda  and  the  sulphate  of  iron  sepa- 
rately, mix  the  solutions,  and  wash  well  the  resulting  phosphate 
of  iron.  Then  to  one-half  of  the  phosphoric  acid  dissolved  in 
one  ounce  of  water,  add  liquor  ammonia  until  it  is  saturated. 
To  the  other  half  of  the  phosphoric  acid  dissolved  in  a  like 
quantity  of  water,  add  the  moist  phosphate  of  iron,  and  dissolve 
by  a  gentle  heat.  Then  add  the  solution  of  phosphate  of  ammo- 
nia and  the  sugar,  and  evaporate  to  seven  fluid  ounces. 
This  gives  a  syrup  containing  thirty-six  grains  of  phosphate 
of  iron,  thirty-eight  grains  of  phosphate  of  ammonia,  and  twenty- 
eight  grains  of  phosphoric  acid  to  the  fluid  ounce,  or  4i  grains 
of  the  iron  salt,  4J  grains  of  the  amnioniacal  salt,  and  3i  grains 
of  the  acid  to  the  teaspoonful. 
The  preparation  seems  to  be  a  stable  one,  but  whether  it  be  a 
chemical  compound  in  which  the  iron  and  ammoniacal  salts  exist 
as  a  double  phosphate  of  iron  and  ammonia,  or  whether  the  mix- 
ture be  merely  mechanical,  I  am  not  prepared  to  say— but  this 
I  feel  confident  of,  that  the  addition  of  the  phosphate  of  ammo- 
nia to  the  solution  of  the  soluble  phosphate  of  iron,  adds  greatly 
