I).  VAN  NO  STRAND.

43

Bow  oii  Bracing.
156  Illustration8  on  Stone.  8vo.  Clotb.  $1.50.
j  A  TKEATISE  ON  BRACING,  with  its  application  to  Bridges
and  other  Structures  of  Wood  or  Iron.  By  Robert  Henry
Bow,  C.  E.

Howard’s  Eartliwork  Mensuration.
8vo.  Illustrated.  Clotb.  $1.50.
EARTHWORK  MENSURATION  ON  THE  BASIS  OF
THE  PRISMOIDAL  FORM  UHE.  Containing  simple  and
labor-saving  method  of  obtaining  Prismoidal  Contents  directly ­
  from  End  Areas.  Illustrated  by  Examples,  and  accompanied
  by  Plain  Rules  for  practical  uses.  By  Conway  R.
Howabd,  Civil  Engineer,  Richmond,  Ya.

McAlpine’s  Modern  Engineering.
Second  Edition.  8vo.  Clotli.  $1.50.
MODERN  ENGINEERING.  A  Lecture  delivered  at  the  American ­
  Institute  in  New  York.  By  William  J.  McAlpwe.

Mowbray’s  Tri-Nitro-Glycerine.
8vo.  Cloth.  Illustrated.  $3.00.
TRI-NITRO-GLYCERINE,  as  applied  in  the  Iloosac  Tunnel,
and  to  Submarine  Blasting,  Torpedoes,  Quarrying,  etc.  Being
the  result  of  six  years’  observation  and  practice  during  the
manufacture  of  five  hundred  thousand  pounds  of  this  explosive, ­
  Mica  Blasting  Powder,  Dynamites;  with  an  account  of