534  Contributions  from  the  School  of  Pharmacy,  etc.  {AmDJeGcU,r"i87h6arm' 
with  dilute  solution  of  caustic  potash  or  soda,  and  any  barrels,  tubs, 
etc.,  should  be  kept  filled  with  lime  water  when  not  in  use,  as  the  ten- 
dency of  the  wort  which  may  be  left  in  them  is  very  great  toward  fer- 
mentation, and  a  few  grains  of  malt  accidentally  left  in  the  tub,  and 
which  have  undergone  putrefactive  change,  may  completely  spoil  the 
subsequent  batch  of  malt  at  the  next  mashing. 
Extract  of  malt  with  iron  is  easily  prepared  by  the  addition  of  a 
syrupy  solution  of  ferric  pyrophosphate,  in  the  proportion  of  four  grains 
to  the  tablespoonful. 
Extract  of  malt  with  pepsin  has  been  proposed  as  a  valuable  prepara- 
tion in  dyspeptic  troubles,  since  it  would  certainly  have  valuable  diges- 
tive properties,  acting  upon  both  amylaceous  and  albuminous  sub- 
stances. 
Extract  of  malt  with  cod  liver  oil  is  proposed  as  the  acme  of  all 
emulsions  of  cod  liver  oil.  When  we  reflect  on  the  fact  of  cod  liver 
oil  being  simply  food  and  not  medicine,  and  then  combine  this  with  a 
preparation  having  of  itself  the  property  of  transforming  non-assimila- 
ble food  into  that  which  may  be  easily  assimilated,  beside  being  a 
valuable  nutrient,  we  have  as  an  emulsion  (and  it  makes  a  perfect 
emulsion  without  the  use  of  any  gum,  sugar  or  other  vehicle)  a  prepara- 
tion of  double  the  nutrient  value  of  the  ordinary  emulsions  of  cod 
liver  oil.  A  preparation,  also,  that  is  very  pleasant  to  the  palate  as  well 
as  the  stomach,  a  fact  that,  in  these  days  of  elegant  pharmacy  need 
not  be  overlooked. 
Samples  of  this  preparation,  consisting  of  50  per  cent,  each  of  cod 
liver  oil  and  extract  of  malt,  are  here  presented.  It  is  easily  prepared, 
is  both  pleasant  and  permanent,  and  may  be  mixed  with  water  without 
separating  the  oil. 
CONTRIBUTIONS  FROM  THE  SCHOOL  OF  PHARMACY  OF  THE 
UNIVERSITY  OF  MICHIGAN. 
Communicated  by  Prof.  Albert  B.  Prescott. 
IX.  Precipitations  by  the  Phosphoric  Acids.    By  James  W.  Morgan,  Ph.C. 
This  investigation  was  to  ascertain  what  normal  metallic  salts,  in 
solution,  will  form  precipitates  by  addition  of  solutions,  respectively,  of 
rree  orthophosphoric,  pyrophosphoric  and  metaphosphoric  acids.  Far- 
ther, in  cases  of  such  formation  of  precipitates,  what  quantities  of 
certain  acids  are  needed  to  dissolve  them  ;  and,  in  cases  of  non-forma- 
