66  Gleanings  from  the  Foreign  Journals,  \Am 'Y°^r\^rm' 
liquid,  the  resin  having  a  higher  specific  gravity. — Phar,  Zeitung,  1875, 
No.  102. 
Salicylate  of  ammonium  is  recommended  by^  Martenson  for  internal 
use.  It  is  readily  prepared  by  neutralizing  salicylic  acid  diffused  in 
water,  with  ammonia  or  carbonate  of  ammonium,  whereby  a  solution 
of  any  desirable  strength  may  be  obtained.  Evaporated  upon  a  water- 
bath,  some  ammonia  escapes,  and  the  liquid  becomes  acid  ;  if  suffi- 
ciently concentrated,  and,  if  necessary,  again  neutralized,  the  salt  will 
crystallize,  on  cooling,  in  shining  needles,  which  are  readily  soluble  in 
water  and  alcohol.  The  aqueous  solution  keeps  unaltered  for  a  long 
time,  has  a  sweetish,  insipid  taste,  and,  when  mixed  with  mineral  or 
organic  acids,  deposits  salicylic  acid.  The  salt  is  given  dissolved  in 
aromatized  water,  or  in  the  form  of  syrup  ;  combination  with  fruit- 
syrups  must  be  avoided. — Ibid. 
Detection  of  Carbolic  Acid  in  Oil  of  Cloves. — Jacquemin  recommends 
to  add  to  the  oil  the  fraction  of  a  drop  of  anilin,  and  then  to  shake  it 
with  5  to  6  times  its  quantity  of  water,  to  which  subsequently  a  few 
drops  of  chlorinated  soda  solution  are  added.  Pure  oil  of  cloves  will 
produce  a  purplish-violet  color,  which  gradually  becomes  fainter ;  in 
the  presence  of  carbolic  acid  a  bright-blue  coloration  is  produced  in  a 
few  minutes,  if  agitation  is  avoided  after  the  last  addition.  One  per 
cent,  of  phenol  may  thus  be  detected  in  one  drop  of  the  oil. — Ibid., 
from  four,  de  Phar.  et  de  Chim. 
Preparation  of  E?nulsions  of  Gum  Resins. — The  difficulty  of  preparing 
emulsions  of  ammoniac  and  other  gum  resins  during  the  summer  time, 
is  overcome,  according  to  E.  Gasser,  by  manipulating  as  follows  :  2  or 
4  grams  of  ammoniac  are  triturated  in  a  mortar  as  well  as  possible  ; 
then  2  grams  of  water  are  added,  and  afterwards  2  grams  of  alcohol. 
The  latter  is  ignited,  and  when  the  flame  is  extinguished  2  grams  of 
powdered  gum  arabic  are  added  to  the  warm  mixture,  and  the  whole 
rapidly  agitated,  after  which  the  emulsion  is  finished  by  the  gradual 
addition  of  the  excipient.  The  above  is  a  modification  of  the  process 
proposed  by  Oppermann  in  his  "  Cours  de  Pharmacies — Ibid.,  No. 
103,  from  four,  de  Phar.  d? Als.-Lorr. 
Glycerol  of  Tar. — Ch.  Peyronnet  obtains  a  perfectly  homogeneous 
preparation,  of  the  consistence  of  an  ointment,  by  operating  as  follows  : 
5  grams  of  starch  are  well  mixed  with  the  same  quantity  of  water  j 
