Am.  Jour.  Pharm. 
July,  1910. 
Book  Reviews. 
345 
CORRESPONDENCE. 
A  CORRECTION. 
To  the  Editor  American  Journal  of  Pharmacy: 
Please  note  that  there  is  a  typographical  error  in  the  last  issue  of 
your  Journal.  Instead  of  "  sodium  arsenate,"  on  page  204,  line  35, 
it  should  read  "  sodium  arsenite." 
Very  truly  yours, 
May  14,  1910.  Elias  Elvove. 
BOOK  REVIEWS. 
Theorie  der  Gewinnung  und  Trennung  des  Atherischen 
Ole  durch  Destillation.  (Grundziige  einer  allgemeine  Destil- 
lationslehre)  von  C.  von  Rechenberg.  Mit  zahlreichen  Abbildun- 
gen  und  Tabellen.  Bearbeitet  im  Auftrage  der  Firma  Schimmel  & 
Co.  in  Miltitz  bei  Leipzig.  Selbstverlag  von  Schimmel  &  Co. 
Miltitz  bei  Leipzig.  (Fur  den  Buchhandel:  L.  Staackmann,  Leip- 
zig), 1900. 
The  present  work  is  a  comprehensive  presentation  of  the  theo- 
retical principles  involved  in  the  distillation  of  ethereal  oils  and 
the  separation  of  the  various  constituents  through  this  process. 
It  may  in  addition  be  regarded  as  a  handbook  on  the  fundamental 
principles  of  distillation  and  furnishes  besides  a  valuable  contribu- 
tion to  phyto-chemistry  as  well  as  applied  chemistry.  In  the  preface 
it  is  gratifying  to  note  also  that  the  second  edition  of  the  work  on 
"  Ethereal  Oils,"  by  Gildemeister  and  Hoffmann,  is  being  prepared 
by  Dr.  E.  Gildemeister  and  that  this  will  cover  two  volumes,  the 
first  volume  of  which  will  probably  be  published  before  the  end  of 
the  present  year. 
There  is  probably  no  other  class  of  substances  employed  in  medi- 
cines and  in  the  arts  which  are  so  extensively  used,  and  which  at  the 
same  time  are  commercially  of  such  varying  quality  and  of  which 
the  users  have  so  little  knowledge,  generally  speaking,  as  the  essen- 
tial oils.  We  are  greatly  indebted  to  the  firm  of  Schimmel  &  Co. 
for  their  pains  in  supplying  valuable  and  authentic  information  for 
the  benefit  of  the  trade,  as  well  as  assistance  of  chemists ;  and  for 
their  generous  employment  of  scientific  members  of  their  staff 
and  also  special  chemists  in  correlating  the  results  obtained  in  the 
