AAuJg.T,  iP872BM'}     Gleanings  from  European  Journals.  353 
with  carbonate  of  baryta  or  litharge ;  the  filtrate  is  precipitated  by- 
dilute  sulphuric  acid,  the  precipitate  washed,  dried  and  heated,  and 
its  weight  calculated  into  that  of  pure  carbolic  acid. — Pharmac.  Centr. 
Halle,  1872,  N.  25. 
Dry  Narcotic  Extracts;  Correction. — The  temperature  given  in 
Stromeyer's  paper  on  this  subject  (see  page  300  of  July  number) 
should  be  50°  C,  and  not  80°,  as  published. — Archiv.  d.  Pharm. 
1872,  April,  41. 
To  prevent  Gum  Solutions  from  Moulding,  A.  Hirschberg  adds 
a  few  drops  of  sulphuric  acid,  and  decants  from  the  subsided  sulphate 
of  lime.  After  keeping  for  18  months,  it  had  neither  moulded  nor 
lost  its  adhesive  properties.* — Ibid.  p.  44. 
The  preservation  of  Milk  by  Boracic  Acid  has  been  experimented 
with  by  A.  Hirschberg,  who  observed  that  two  pounds  recently  drawn 
milk,  in  which  1  drachm  of  boracic  acid  has  been  dissolved,  will  show 
a  very  faint  acid  reaction,  (temp.  10°  R.=55°  F.,)  after  96  hours,  but 
even  after  120  hours,  merely  a  thin  film  of  cream  had  separated. — 
Ibid.  45,  46. 
The  Sugars  in  the  Rhizome  of  Couch  grass,  Triticum  repens,  Lin., 
have  been  examined  by  Prof.  H.  Ludwig  and  H.  Mueller,  who  found, 
1,  a  sugar  (fruit  sugar)  turning  polarized  light  strongly  to  the  left ; 
2,  a  sugar  rotating  to  the  right,  (not  cane  sugar ;)  3,  a  peculiar  left 
rotating  gum,  copulated  in  a  peculiar  manner  with  nitrogenated  com- 
pounds, and  yielding,  by  splitting,  left-rotatory  sugar ;  4,  sweet  com- 
pounds intermediate  between  this  gum  and  fruit  sugar,  and  copulated 
with  nitrogenated  compounds. — Ibid.    May,  132-147. 
To  render  Cloth  and  other  Fabrics  Moth  and  Water-Proof  a  solu- 
tion of  acetate  of  alumina  is  prepared  by  mixing  solutions  of  equal 
weights  of  alum  and  sugar  of  lead.  The  clear  liquid  is  diluted  with 
wa,ter  and  mixed  with  solution  of  isinglass.  In  this  mixture  the  arti- 
cles are  left  for  about  12  hours,  until  they  are  thoroughly  saturated, 
when  they  are  dried  and  pressed,  or  otherwise  finished. — Chem.  Cen- 
tralblatt,  1872,  No.  22,  from  Fcirber  Ztg.,  No.  8. 
Cement  for  Chemical  Apparatus. —  Otto  Facilides  mixes  syrupy 
solutions  in  benzine,  prepared  with  the  aid  of  heat,  of  shellac  and 
*  For  years  past,  we  have  used  alum  for  this  purpose,  with  the  same  good 
effect. — Editor  Amer.  Jour.  Pharmacy. 
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