Am.  Jour.  Pharm.  ) 
December,  1920.  ) 
Book  Reviews. 
943 
The  extensive  collection  of  useful  subject  matter  and  references 
found  in  this  book  should  appeal  alike  to  veterinarians,  agricul- 
turalists and  economics  botanists  generally.  The  farmer,  who  should 
be  aware  of  the  kinds  of  weeds  his  stock  is  likely  to  feed  upon,  will 
find  the  text  extremely  useful  and  written  in  understandable 
language.  For  teachers  and  students  in  veterinary  colleges  this 
book  satisfies  a  distinct  need.  H.  W.  Youngkkn. 
A  Te^xtbook  of  Organic  Chemistry.  By  E.  DeBarry  Barnett, 
B.Sc.  (London),  A.I.C.  360  pages.  P.  Blakiston's  Son  and  Co., 
Philadelphia,  1920.    Price,  $5.00. 
The  preface  states  that  "this  volume  is  intended  as  a  companion 
volume  to  the  author's  'Preparation  of  Organic  Compounds.'  " 
In  it  he  "has  endeavored  to  give  a  general  survey  of  the  most  im- 
portant classes  of  organic  compounds.  Emphasis  has  been  laid  on 
group  -  reactions  rather  than  on  the  reactions  of  individual  com- 
pounds, so  that  the  number  of  individual  substances  mentioned  is 
smaller  than  is  the  case  in  most  textbooks." 
Chapter  I  discusses :  the  methods  in  general  use  for  the  elemental 
analysis,  qualitatively  and  quantitatively,  of  organic  compounds; 
the  several  methods  for  determining  molecular  weights;  isomerism 
(including  stereochemistry)  and  formulae;  classification;  nomencla- 
ture; and  concludes  with  four  pages  on  the  literature  of  organic 
chemistry. 
The  remaining  fifteen  chapters  are  devoted  to  the  Aliphatic 
Compounds  (hydrocarbons,  halogen  derivatives,  alcohols  and  mer- 
captans,  ethers  and  sulphides,  aldehydes  and  ketones,  carboxylic 
acids,  nitriles  and  analogous  compounds,  amines  and  similar  com- 
pounds, amino  acids  and  peptides,  hydroxy,  aldehydic  and  ketonic 
acids,  carbohydrates)  and  the  Aromatic  Compounds  (hydrocarbons, 
halogen  compounds,  nitroso  and  nitro  compounds,  amino  com- 
pounds, sulphonic  acids,  alcohols,  phenols  and  phenolic  ethers, 
aldehydes,  ketones,  and  quinones,  diazo  and  diazo-amino  com- 
pounds, azoxy,  azo  and  hydrazo  compounds,  carboxylic  acids  and 
derivatives,  anthraquinone  and  derivatives,  triphenylamine  dyes, 
alicyclic  compounds,  heterocyclic  compounds,  purines  and  alkaloids). 
For  each  class  of  compounds  there  is  given:  an  explanation  of  the 
molecular  structure,  illustrated  by  formulas;  the  general  methods 
for  their  preparation,  illustrated  by  equations,  or  by  formulas  of 
compounds  formed  as  steps  in  their  synthesis;  and  statements  re- 
