332  USE  AND  PROPERTIES  OF  PERCHLORIDE  OF  IRON. 
I  have  not  as  yet  been  able  to  obtain  specimens  of  water  south 
of  San  Diego,  nearer  the  shore  than  the  usual  route  of  the  mail 
steamers.  Neither  have  I  been  able  to  test  the  breadth  of  this 
boracic  acid  belt  any  further  than  the  fact  above  stated,  of  no 
acid  being  found  at  the  distance  of  thirty  or  forty  miles  west 
from  the  Golden  Gate.  I  think  it  probable  that  it  is  confined 
within  the  submarine  ridge  running  parallel  with  the  coast,  the 
southern  portion  of  which  is  indicated  by  certain  shoals  and 
island  groups.  The  source  of  the  acid  is  undoubtedly  volcanic, 
and  the  seat  of  the  volcanic  action  is  most  likely  to  exist  in  this 
submerged  mountain  range.  It  strengthens  the  probability  of 
the  eruptive  character  of  the  Cortez  Shoals. 
I  hope  in  future  to  be  able  to  make  more  accurate  and  extend- 
ed examinations,  unless  some  one  more  capable  of  doing  justice 
to  the  subject  should  take  it  in  hand.  With  this  view,  I  solicit- 
ed the  attention  of  Dr.  J.  S.  Newberry  to  these  facts  while  he 
was  in  this  city,  on  his  way  to  join  Lieutenant  Ives'  Colorado 
Exploring  Expedition,  hoping  he  might  think  it  worthy  of 
investigation  during  his  stay  on  this  coast.  With  the  same 
view,  I  now  submit  them  to  the  Academy. — Pacific  Med. 
and  8ur.  Journ.  April,  1860,  from  Proc.  Cal.  Acad.  Nat.  Sci. 
USE  AND  PROPERTIES  OF  PERCHLORIDE  OF  IRON. 
The  solution  of  this  persalt  is  now  almost  universally  employ- 
ed to  arrest  arterial  or  venous  hemorrhage,  resulting  either  from 
accident,  or  as  a  consequence  of  surgical  operations.  It  has 
also  been  found  useful  in  intestinal  hemorrhage  ;  in  one  case  in 
particular.  M.  Demarquay,  of  Paris,  administered,  morning 
and  evening,  enemata  of  seven  ounces  of  fluid,  with  twenty 
drops  of  the  concentrated  solution  of  perchloride  of  iron,  and  a 
teaspoonful  of  the  perchloride  syrup  (five  or  six  drops  to  the 
tablespoonful,)  where  the  hemorrhage  from  the  bowels  was  con- 
siderable, and  had  resisted  the  ordinary  remedies.  The  result 
was  extremely  satisfactory.  The  same  surgeon  relates  a  second 
case  of  extensive  abscess  of  the  shoulder,  where  an  injection  of 
iodine  caused  severe  hemorrhage.  This  was  arrested  by  throw- 
ing into  the  sac  a  lotion  composed  of  seven  ounces  of  water  and 
ten  drops  of  the  perchloride. 
