Am,jJu°iy?i906frm"}    Abstracts  of  Theses  on  Chemical  Subjects.  333 
glycerin  with  the  paste.  The  results  were  indifferent,  but  encourag- 
ing. Finally  the  idea  of  applying  a  coat  of  pure  glycerin  to  the 
back  of  the  label  suggested  itself,  and  then  the  problem  was  solved. 
The  paper  absorbs  enough  glycerin  to  prevent  contraction,  yet  per- 
mits the  necessary  drying  of  the  adhesive.  I  find  the  following  a 
good  method  to  pursue :  Keep  a  convenient  supply  of  glycerin  in 
a  wide  mouth  bottle ;  when  required  for  use,  tilt  until  glycerin  runs 
into  the  neck,  then  return  the  bottle  to  a  vertical  position.  It  will 
be  found  that  enough  glycerin  to  moisten  the  tip  of  a  finger  remains 
within  reach.  Apply  with  the  finger  to  the  back  of  the  label  and 
immediately  paste  over  it  as  usual. 
ABSTRACTS  OF  THESES  ON  CHEMICAL  SUBJECTS.1 
By  J.  W.  Bhman. 
Extemporaneous  Sulphurous  Acid.  By  F.  L.  Cheney. — Mr.  Cheney 
made  numerous  experiments  having  in  view  the  preparation  of 
extemporaneous  sulphurous  acid  by  a  process  similar  to  that  of 
compound  solution  of  chlorine. 
Experiments  were  first  made  by  adding  a  solution  of  tartaric  acid 
to  calcium  sulphite  and  also  to  potassium  sulphite,  both  of  which 
give  difficultly  soluble  by-products.  The  calcium  and  potassium 
salts  obtained  in  the  market  were,  however,  found  to  be  so  variable 
in  quality  that  these  were  rejected. 
Sodium  sulphite  and  bisulphite  of  approximately  U.S. P.  strength 
were  treated  with  hydrochloric  acid  and  the  sodium  chloride  formed 
left  in  the  solution. 
The  following  formula  is  recommended  as  giving,  after  repeated 
trials,  the  best  results:  Dry  acid  sodium  sulphite,  5-7  grammes; 
dilute  hydrochloric  acid,  18-5  c.c. ;  water,  25  ex.  Add  the  acid  to 
the  salt  placed  in  a  fair-sized  (8  ounce)  glass-stoppered  bottle, 
quickly  stopper  and  set  aside  in  a  cool  place.  Agitate  slightly  to 
aid  solution  of  the  salt  and  when  effervescence  ceases  add  the  water 
and  agitate  for  a  few  minutes. 
The  product  should  measure  40  c.c.  and  assay  from  6  to  6*5  per 
cent.  S02. 
Liquor  Chlori  Compositus.    By  William  R.  Shearer. — As  a  result 
1The  experimental  work  embodied  in  these  theses  was  performed  in  the 
Chemical  Laboratory  of  the  Philadelphia  College  of  Pharmacy. 
