Am.  Tour.  Pharm. ) 
July,  1920.  ) 
Book  Reviews. 
519 
science  he  will  find  the  study  of  that  obscure  if  he  neglects  others, 
and  these,  though  subsidiary,  should  be  pursued  to  such  an  extent 
that  the  knowledge  acquired  is  real  and  useful.  The  man  with  a 
smattering  is  found  to  be  a  source  of  danger  in  his  profession,  while 
he  contributes  to  the  crowding  out  of  the  more  competent.  The 
trained  technical  man's  bag  of  tools  is  his  brain;  the  tools  consist  of 
the  departments  of  knowledge  he  is  able  to  exercise;  the  better  he  is 
able  to  use  them  by  the  aid  of  his  'common  sense,'  the  more  successful 
is  he  likely  to  be  in  practice;  the  broader  his  training,  the  better 
his  equipment." 
Under  Professional  Organizations,  the  author  declares:  "Mem- 
bership should  be  sought,  therefore,  from  a  desire  to  assist  in  main- 
taining the  prestige  of  the  profession  generally  as  much  as  for  any 
direct  advantage  to  the  individual." 
Much  that  is  of  interest  and  value  will  be  found  throughout  the 
book  which  deserves  a  careful  perusal.  The  concluding  chapters 
are  along  constructive  lines  and  are  headed:  Chemistry  and  the 
State,  Teaching,  Women  in  Professional  Chemistry,  and  Chemists 
in  War.  The  book  is  well  indexed  and  should  find  a  place  in 
every  chemist's  library.  C.  H.  L. 
Food  Inspection  and  Anai^ysis  for  thej  Usk  of  PubIvIC  Anai^ysts, 
Health  Officers,  Sanitary  Chemists  and  Food  Economists. 
By  Albert  E.  Leach,  S.B.    Revised  and  enlarged  by  Andrew  L. 
Winton,  Ph.D.,  4th  edition.    John  Wiley  &  Sons,  Inc.  $8.50. 
This  valuable  work,  used  both  as  a  working  manual  and  as  a 
reference  book  by  food  officials,  who  usually  refer  to  it  simply  as 
"Leach's,"  is  always  welcomed  in  a  new  edition,  for  there  are  so 
many  changes  and  improvements  in  methods  and  so  much  valuable 
data  is  constantly  accumulating  that  a  book  of  this  type  should  be 
revised  at  least  every  five  years. 
The  present  new  (4th)  edition  has  been  increased  in  size  by  90 
pages  over  the  previous  edition.  This  in  reality  means  a  much 
greater  increase  in  new  matter,  for  the  bibliographical  notes  at  the 
end  of  each  chapter  have  been  eliminated  entirely,  as  they  were  by 
no  means  complete  and  were  frequently  misleading. 
Space  has  also  been  gained  by  the  discontinuance  of  a  large 
amount  of  tabulated  matter  in  Chapter  2  of  the  3d  edition,  on 
reagents. 
A  chapter  on  the  hydrogen  ion  concentration  and  its  determination 
