72  Practical  Notes  from  Various  Sources.  {Am>Je°bU^§rarm* 
rocresylsulphonic  acid.  Like  resorcin  and  ichthyol  it  is  a  keratoplasty 
remedy.  In  burns  it  eases  pain  quicker  than  resorcin  or  cocaine,  and 
is  worthy  of  further  dermatological  experiments. — Rundschau,  Prag, 
xii,  page  955. 
Bark  of  Pomegranate  Root. — By  digesting  170  grams  of  pomegran- 
ate root  bark  with  water  slightly  acidulated  with  acetic  acid  at  a  tem- 
perature of  70°C.  for  12  hours  and  repeating  the  operation  twice; 
then  mixing  the  liquids,  precipitating  with  acetate  of  lead,  removing 
excess  of  lead  with  sulphuretted  hydrogen  and  evaporating  the  nitrate 
below  60  °C.  to  syrupy  consistence,  a  liquid  free  from  the  astringent 
and  disagreeable  taste  of  the  bark  is  obtained.  The  quantity  men- 
tioned above  is  for  one  dose. — Phar.  Zeit.fur  Russland,  xxv,  page  707. 
Luminous  paper. — The  following  formula  yields  a  paper  which  is 
impervious  to  water  and  luminous  in  the  dark.  Water  100  parts, 
paper  40,  phosphorescent  powder  10,  gelatin  1,  bichromate  of  potas- 
sium 1  part.  The  bichromate  of  potassium  makes  the  paper  impervi- 
ous.— Phar.  Zeit.  fur  Russl.,  xxv,  page  712  •  see  also  Amee.  Joue. 
Phae.,  1886,  p.  536. 
PEACTICAL  NOTES  FROM  VARIOUS  SOURCES. 
By  the  Editor. 
Toothache  Drops. — A  solution  is  recommended  in  U  Union  medi- 
cate, composed  of  camphor,  balsam  of  Peru  and  alcoholic  extract  of 
opium,  of  each  1  gms,  and  mastic  2  gm.  in  chloroform  20  gm.  A 
pellet  of  cotton  moistened  with  this  liquid  is  introduced  into  the 
cavity  of  the  tooth. 
Collodion  of  iodoform  has  been  successfully  used  for  the  relief  of 
neuralgia,  and  is  usually  prepared  by  dissolving  1  part  of  iodoform 
in  15  parts  of  collodion.  Occasionally  10  per  cent.,  and  even  25  per 
cent,  solutions  have  been  employed. — Nouv.  Remedes,  1886,  p.  525. 
An  older  formula  by  James  directs  iodoform  5,  balsam  of  Peru  5, 
powdered  soap  5,  and  collodion  85  parts. 
Preparation  of  pure  Diastase. — C.  J.  Lintner  recommends  {Jour, 
f.  praJct.  Chemie,  xxxiv,  378)  digesting  undried  or  air-dried  malt 
with  alcohol  of  20  per  cent.,  and  precipitating  the  decanted  solution 
with  absolute  alcohol.  The  pale  yellowish  noccules  are  repeatedly 
treated  with  absolute  alcohol,  then  with  ether,  and  are  afterward  dried 
in  vacuo  over  sulphuric  acid,  when  a  light,  yellowish-white  powder 
