^'^'oT'I^s'^''^'}   Reviews  and  Bibliographical  Notices.  479 
in  some  parts  of  the  United  States,  for  which  a  correspondent  in  Georgia  desires  to 
obtain  the  formula.    Mr.  Jas.  T.  Shinn  has  furnished  us  with  the  following: 
Cort.  cinchona?,        .  .  .  •  •  -5' 
Cort.  aurantii, 
Flor.  anthemid         .  .  .  .  .  5ss 
Fol.  artemisiae  absinth. ,  . 
Fruct.  carui,  .  .  .  .  .        aa  ^ii 
Spt.  vini  gall.,  *  .  .  .  .  .  .  Oi 
Ft.  tinct. 
REVIEWS  AND  BIBLIOGRAPHICAL  NOTICES, 
Beitrdge  %ur  mechan'uchen  Wdrmetheorie.    Von  Baron  N.  Dellingshausen.  Heidel- 
berg :  Carl  Winter's  Universitats-Buchhandlung.    1874.    8vo,  pp.  120. 
Contributions  to  the  Mechanical  Theory  of  Heat. 
This  is  the  continuation  of  a  work,  entitled  "  Principles  of  a  Vibration  Theory 
of  Nature,''  published  by  the  author  a  few  years  ago,  and  in  which  the  physical  differ- 
ences of  bodies  were  explained  by  motion,  disregarding  the  theories  of  atoms, 
molecular  forces  and  imponderables.  The  present  work  enters  more  specially  into 
the  subject,  and  attempts  to  furnish  mathematical  proofs  in  four  essays,  entitled 
Mathematical  Proof  of  the  Vibratory  (undulatory)  Theory  of  Heat  "  The 
Internal  Movements  and  their  Influences  upon  the  State  of  Aggregation  of  Bodies  5" 
"Heat,  an  Internal  Vital  Force  of  Bodies,"  and  "The  Chemical  Heat  of  Bodies." 
The  subject  having  of  late  years  attracted  the  attention  of  physicists,  these  "  Con- 
tributions "  will  be  found  to  be  a  valuable  addition  to  the  literature  of  physical 
science. 
The  Mechanical  Action  of  Light.    By  William  Crookes,  F.  R.  S.,  &c.    London  : 
1875.  pp.  16. 
This  reprint  from  the  July  number  of  the  "  Quarterly  Journal  of  Science  "  con- 
tains an  account  of  the  experiments  made  by  the  author,  with  the  view  of  ascertain- 
ing the  influence  upon  the  motion  of  bodies  contained  in  a  vacuum,  when  exposed 
to  the  influence  of  light  and  heat,  and  which  were  the  subject  of  a  paper  read  be- 
fore the  Royal  Society  a  year  ago.  The  experiments  revealed  the  fact  that,  under 
the  circumstances  stated,  dark  heat  repels  black  and  white  bodies  almost  equally, 
but  the  rays  of  light  repel  black  surfaces  more  energetically,  and  this  mechanical 
action  of  radiation  was  found  to  be  inversely  proportional  to  the  square  of  the  dis- 
tance of  the  light  from  the  blackened  surface.  The  influence  of  heat  may  be  almost 
completely  removed,  by  passing  the  rays  through  a  plate  of  alum,  so  that  the  action 
of  light  alone  may  be  accurately  measured,  by  the  number  of  revolutions,  made  by 
a  light  body  (pith),  properly  suspended  in  the  vacuum  so  as  to  cause  the  least  pos- 
sible friction  when  revolving.  These  are,  briefly  stated,  the  interesting  observations 
upon  which  the  construction  and  use  of  the  author's  radiometer^  for  measuring  the 
intensity  of  light,  are  based. 
Capillary  Bronchitis  of  Adults.  By  Calvin  Ellis,  M,  D. ;  Jackson  Professor  of 
Clinical  Medicine  in  Havard  University.  New  York  :  G.  P.  Putnam's  Sons. 
1875.    8vo,  pp.  36.    Price,  40  cents. 
This  is  the  seventh  number  of  "  A  Series  of  Chemical  Lectures,"  the  publication 
of  which  we  have  announced  on  page  139  of  our  M  irch  number. 
