Am.  Jour.  Pharm.\ 
October,  1904.  J 
Pharmacy  and  Chemistry. 
467 
column  the  amount  of  n/ 10  acid  equivalent  to  the  nitrogen  present 
in  100  c.c.  of  the  solution.  The  titration  results  for  100  c.c.  to  the 
drops'  end  point,  to  the  alizarin  end  point,  and  to  the  phenolphthal- 
ein  end  point  are  to  be  found  in  the  first  three  columns,  n / 10  acid 
being  indicated  by  a  —  quantity,  and  n/  10  alkali  by  a  -j-  quantity. 
For  the  sake  of  comparison  with  the  nitrogen  content,  three  col- 
umns showing  the  range  from  drops  to  phenolphthalein,  from 
alizarin  to  phenolphthalein,  and  from  drops  to  alizarin  have  been 
included.  The  average  of  the  seven  different  concentrations  gives  a 
period  from  drops  to  alizarin  about  twice  that  from  alizarin  to  phe- 
nolphthalein ;  consequently  the  total  range  from  drops  to  phenol- 
phthalein is  three  times  that  from  alizarin  to  phenolphthalein.  A 
comparison  of  these  figures  shows  a  relationship  of  3 :  1  :  2  :  10-5  for 
these  three  quantities  as  compared  with  the  nitrogen. 
From  these  results  it  appears  possible  that  some  sort  of  relation- 
ship obtains  between  the  various  types  of  nitrogen-containing  groups 
in  the  proteid  and  the  end  points  of  various  indicators.  This  que^- 
tion  will  be  further  considered  in  the  next  portion  of  this  paper 
dealing  with  artificial  peptic  digestion.  One  point,  however,  is 
clearly  brought  out  by  the  use  of  Witte's  peptone  :  that  the  amount 
of  impurities  retained  by  the  peptone  hydrochloric  acid,  phosphates, 
organic  acids,  etc.,  which  could  produce  an  effect  upon  indicators  is 
too  small  to  account  for  any  of  the  recorded  figures. 
[  To  be  continued.'] 
PHARMACY  AND  CHEMISTRY  AT  THE  WORLD'S  FAIR. 
By  Cari,  G.  Hinrichs,  Ph.C, 
Professor  of  Chemistry,  Marion- Sims  Dental  College. 
{Contifiued from  p.  413.) 
IV.  FRANCE  :  A  LIVE  PHARMACEUTICAL  AND  CHEMICAL  EXHIBIT. 
In  the  very  large  French  section  of  the  Liberal  Arts  Palace  we 
find  an  extended  display  made  by  enterprising  chemical  and  phar- 
maceutical firms.  Here  are  not  only  polite  guards  who  do  give  you 
intelligent  replies  to  inquiries  about  exhibits,  but  also  technical  and 
commercial  experts  representing  the  separate  firms.  What  a  pleasure 
it  is  to  find  oneself  at  home  after  a  visit  to  the  British  section ! 
"  La  chimie  est  une  science  Francaise."  While  this  celebrated 
statement  of  Wurtz  is  a  trifle  too  broad,  still  it  must  be  admitted 
