354        Convenient  Apparatus  for  Hot  Filtration.  {^'^k^Z'^I^i''^' 
extension  of  its  use,  with  the  request  also  that  careful  reports  on  the 
results  may  be  submitted  at  the  end  of  a  year. 
Whether  this  remedy  may  ever  become  popular  in  this  country  for 
skin  diseases,  or  whether  it  may  be  as  successful  here  for  such  as  it  has- 
been  in  India  for  the  more  inveterate  leprous  form,  are  questions  which 
time  and  experiment  alone  can  determine.  But,  meantime,  it  is  excit- 
ing no  little  interest  in  medical  circles,  and  Professor  Erasmus  Wilson 
lately  reported  the  most  encouraging  results  from  its  use  in  cases  of 
painful  eczema,  in  lupus,  and  in  cancer  ;  and  further  reported  the  case 
of  a  lady,  who  had  not  obtained  sleep  without  the  use  of  narcotics  for 
weeks,  until  the  liniment  was  applied,  when  she  was  relieved  of  all 
pain  and  obtained  natural  sleep. — Pharm.  Journ,  and  Trans..  Mar.  13. 
A  CONVENIENT  APPARATUS  FOR  HOT  FILTRATION. 
BY  H.  CARRINGTON  BOLTON,  PH.  D. 
[Read  before  the  Ne-xv  York  Academy  of  Sciences,  May  10,  1875.) 
Every  working  chemist  has  experienced  the  need  of  a  convenient 
apparatus  for  hot  filtration.  Hot  saturated  saline  solutions  which  crys- 
tallize on  cooling  in  the  filter  or  in  the  neck  of  the  funnel,  and  viscid 
liquids  possessing  the  necessary  mobility  only  so  long  as  a  higher  tem- 
perature than  the  average  is  maintained,  render  the  employment  of 
some  form  of  apparatus  for  hot  filtration  indispensable.  While  much 
attention  has  been  given  of  late  to  the  construction  of  apparatus  for 
rapid  filtration,  as  the  innumerable  forms  of  water  pumps  and  steam 
injectors  abundantly  show,  little  has  been  done  towards  improving  the 
existing  forms  of  apparatus  for  hot  filtration  or  the  contrivance  of  new 
ones. 
Two  kinds  of  apparatus  have  come  under  our  observation.  The 
first  of  these,  invented  by  Dr.  Hare,  is  the  well-known  funnel  support 
usually  constructed  of  tinned  iron  with  double  walls  and  a  conical 
aperture  for  inserting  a  glass  funnel ;  the  space  between  the  walls 
being  filled  with  water  or  other  liquid,  it  is  kept  at  a  boiling  heat  by  a 
lamp  placed  under  a  cavity  shaped  like  an  inverted  funnel.  A  more 
compact  form  of  the  same  apparatus  was  contrived  by  Plantamour,  in 
which  the  metallic  box  is  given  the  form  of  a  cone,  and  heat  is  applied 
to  a  hollow  cylindrical  projection  filled  with  the  liquid  employed,  and 
communicating  with  the  space  between  the  double  walls. 
While  this  apparatus  is  well  adapted  to  the  use  of  pharmaceutists,  or 
