192 
Book  Reviews. 
/  Am.  Jour.  Pharm. 
1      April,  1906. 
$3.00.  New  York:  John  Wiley  &  Sons.  London:  Chapman  & 
Hall,  Limited.  1905. 
That  Morgan's  "  Physical  Chemistry  "  is  appreciated  is  shown  by 
the  appearance  of  the  third  edition.  It  is  very  clear  in  the  presenta- 
tion of  the  principles  of  physical  chemistry,  and  in  showing  the  rela- 
tion of  these  to  the  other  branches  of  chemistry.  The  author  has 
succeeded  in  making  physical  chemistry  "  a  tool  by  the  aid  of  which 
actual  results  may  be  obtained."  For  instance,  in  the  chapter  on 
solutions,  he  (p.  123)  shows  how  Young,  by  the  application  of  the 
principles  underlying  this  subject,  has  been  able  to  devise  a  simple 
method  for  preparing  absolute  alcohol  from  a  95-57  per  cent,  alcohol. 
Instead  of  employing  a  dehydrating  agent  and  distilling  the  alcohol 
alone,  as  is  usually  done,  one  can  add  to  the  alcohol  containing  the 
water,  benzene  n  —  hexane,  and  by  fractional  distillation  the  dehy- 
drated alcohol  is  obtained  and  the  benzene  recovered. 
In  this  edition  the  subject  matter  has  been  brought  up  to  date 
and  has  been  made  as  intelligible  as  possible,  even  to  the  non- 
mathematical  reader.  It  is  without  doubt  the  best  book  on  this 
subject  which  has  thus  far  appeared  in  the  English  language. 
Electro-Chemistry  of  Organic  Compounds.  By  Walther  Lob. 
Authorized  translation  from  the  author's  enlarged  and  revised  third 
edition  by  H.  W.  F.  Lorenz.  8vo,  x  -f-  308  pages;  10  figures. 
Cloth,  $3.00.  New  York:  John  Wiley  &  Sons.  London:  Chapman 
&  Hall,  Limited. 
The  great  progress  which  the  electro-chemistry  of  organic  com- 
pounds has  made  in  the  past  few  years  and  the  large  increase  in  the 
quantity  of  new  experimental  material  have  required  a  new  edition 
of  Dr.  Lob's  book  on  this  important  subject.  The  subject  matter 
has  been  entirely  re-written  and  re-arranged.  Part  I  is  devoted  to 
electrolytic  processes :  {a)  Theoretics ;  (b)  Methodics ;  (c)  Electrol- 
ysis of  Aliphatic  Compounds ;  (d)  Electrolysis  of  Aromatic  Com- 
pounds;  (e)  Electrolysis  with  Alternating  Currents;  (/)  Electric 
Endosmose.  In  Part  II  electrothermic  processes  and  the  silent 
electric  dicsharge  are  considered  :  (a)  Theoretics  and  Methodics ;  (b) 
The  Spark  Discharge  and  the  Voltaic  Arc ;  (c)  The  Utilization  of 
Current  Heat  in  Solid  Conductors ;  (d)  The  Silent  Electric  Discharge 
and  the  Effect  of  Tesla-currents. 
