1 86  Benzoin  and  Preparations  of  Benzoin.  {Am-ipru,i89i.rm" 
wrapped  around  it  at  the  places  of  exit  through  the  small  tube  C 
attached  to  the  shoulders.  The  ball  lamp  wick  used  for  alcohol 
lamps  I  have  found  to  make  an  excellent  packing.  The  caps  are 
now  screwed  down  so  as  to  impinge  on  the  packing  and  tightly 
compress  it  in  the  shoulder  of  the  cap  and  against  the  glass  tube 
making  a  water-tight  connection. 
Figs.  II  and  III  are  full-sized  representations  of  the  arrangement 
of  the  ends  of  the  tube  and  of  the  cap. 
BENZOIN  AND  PREPARATIONS  OF  BENZOIN. 
Abstracts  from  Theses. 
Of  seven  commercial  samples  of  benzoin  examined  by  Luther  G. 
Harpel,  Ph.G.,  two  specimens,  Nos.  2  and  3,  consisted  of  distinct 
tears  of  Siam  benzoin  not  agglutinated  by  darker  colored  resin.  No. 
7  contained  very  few  white  tears,  but  a  large  proportion  of  fragments 
of  bark  and  other  vegetable  matter.  The  remaining  specimens 
were  amygdaloid  benzoin  in  which  the  amount  of  bark  was  smaller 
than  in  No.  7,  but  was  not  estimated,  and  in  which  the  tears  varied 
more  or  less  in  amount  and  size.  The  amount  of  benzoic  acid  was 
determined  by  Scheele's  process  with  lime,  and  by  the  process  of 
Bucholz  with  sodium  carbonate,  using  alcohol  for  dissolving  the 
benzoin  as  suggested  by  Stoltze.  The  test  for  cinnamic  acid  was 
made  with  potassium  permanganate  added  to  the  acids  after  having 
been  liberated  from  the  lime  solution,  the  odor  of  benzaldehyde 
being  produced  in  the  presence  of  cinnamic  acid.  The  following  table 
gives  the  results  obtained. 
Samples  1234s  6  7 
Scheele's  process,  S"oo  7*00  8-oo  4-00  8'6  47  3  00  p.c. 
Stoltze's       "  8-25       7-50       775       4-00       9-00       5-00       3-00  p.c. 
Bitter  Almond  Odor,  strong  none     none   decided  decided  strong  strong 
Adeps  benzoinatus  of  good  quality  is  obtained  by  following  one 
of  the  three  methods  described  below,  as  suggested  by  John  N. 
Prass,  Ph.G.  Concentrate  upon  a  water-bath  1  ^  fl.  oz.  of  tincture  of 
benzoin;  to  the  residuary  thick  liquid  add  in  small  portions  and 
incorporate  well  16  oz.  of  lard;  digest  the  mixture  in  a  water-bath 
for  about  two  hours  until  the  alcohol  has  been  driven  off ;  strain 
through  cotton  flannel  and  cool.  Or  two  parts  of  benzoin  in  No.  40 
or  60  powder  is  incorporated  with  100  parts  of  lard,  the  mixture 
