Am.  Jour.  Pharm.  \ 
January,  1921.  f 
Book  Reviews. 
69 
ment  for  any  pharmacopoeial  drug,  chemical  or  preparation,  or  for 
other  requirements  of  the  Pharmacopoeia,  is  invited  to  send  this 
at  once  to  the  chairman,  who  will  see  that  it  is  properly  considered. 
PUBLICITY. 
From  time  to  time  important  decisions  of  the  committee  and  a 
report  of  the  progress  of  the  revision  will  be  made  public  through 
the  chairman's  office,  so  that  all  may  follow  the  work  of  revision. 
When  revised  texts  have  followed  their  regular  course  of  sub- 
committee consideration,  Executive  Committee  study,  and  are 
finally  before  the  General  Committee,  an  abstract  of  the  proposed 
changes  will  also  be  published,  giving  every  one  who  is  interested 
an  opportunity  to  know  the  new  standards  before  they  are  actually 
printed.  This  plan  was  found  of  much  value  in  the  last  revision 
and  is  fully  in  keeping  with  the  policy  of  the  present  Committee  of 
Revision. 
BOOK  REVIEWS 
"Dictionary  of  Explosives,"  By  Arthur  Marshall.   XIV,  159 
pages.    P.  Blakiston's  Son  &  Co.,  Philadelphia,  Pa.,  1920. 
The  appearance  of  this  little  book  is  timely,  as  it  has  been 
twenty-five  years  since  the  publication  of  the  last  book  of  this  kind 
— that  by  Cundill  and  Thomson,  and  during  this  time,  especially 
during  the  past  few  years,  there  has  been  great  activity  in  the 
development  of  commercial  and  military  explosives.  In  his  little 
''Dictionary"  Mr.  Marshall  has  given  in  concise  form  such  infor- 
mation as  is  usually  contained  in  Government  bulletins  on  the 
various  types  of  explosives  having  special  or  trade  names.  In 
individual  cases  the  following  facts  have  been  given :  Use,  manu- 
facturer, date  of  permit  (or  whether  permissible),  composition, 
limit,  charge  and  power  (as  indicated  by  the  ballistic  pendulum). 
In  the  case  of  some  of  the  British  explosives  this  information  is 
fairly  complete,  but  in  the  case  of  American,  German,  French  and 
other  explosives  the  information  is  usually  meager. 
Preceding  the  dictionary  proper  there  is  a  classification  of  ex- 
plosives into  the  following  groups : 
Coal  mine  explosives,  blasting  explosives,  high  explosives,  mis- 
