390 
VARIETIES. 
8.  The  dry  mouth  of  atropia  is  not  made  less  by  the  coincident 
or  precedent  use  of  morphia.  Atropia  does  not  constipate,  and 
may  even  relax  the  bowels;  morphia  has  a  reverse  tendency. 
9.  The  nausea  of  morphia  is  not  antagonized  or  prevented  by 
atropia. 
10.  Both  agents  cause  dysuria  in  certain  cases,  nor  is  the 
dysuria  occasioned  by  the  one  agent  relieved  by  the  other. 
11.  Atropia  has  no  ability  to  alter  or  lessen  the  energy  with 
"which  morphia  acts  to  diminish  sensibility  or  relieve  the  pain  of 
neuralgic  disease. 
12.  As  regards  toxic  effects  upon  the  cerebral  organs,  the  two 
agents  are  mutually  antidotal,  but  this  antagonism  does  not  pre- 
vail throughout  the  whole  range  of  their  influence,  so  that,  in 
some  respects,  they  do  not  counteract  one  another,  while  as  con- 
cerns one  organ,  the  bladder,  both  seem  to  affect  it  in  a  similar 
way. — Amer.  Jour,  of  Med.  Sciences,  July,  1865. 
bandies. 
Patent  regenerative  Gas-furnaces  ofC.  W.  &  F.  Siemens. — Professor  Fara- 
day, in  his  lecture  at  the  Royal  Institution,  on  the  20th  June,  1862, 
describes  these  furnaces  in  the  following  terms: — 
"  The  gaseous  fuel  is  obtained  by  the  mutual  action  of  coal,  air  and  water 
at  a  moderate  red  heat.  A  brick  chamber,  perhaps  6  ft.  by  12  ft.,  and  about 
10  ft.  high,  has  one  of  its  end  walls  converted  into  a  fire-grate,  i.e.,  about 
half  way  down  it  is  a  solid  plate,  and  for  the  rest  of  the  distance  consists 
of  strong  horizontal  plate  bars  where  air  enters,  the  whole  being  at  an 
inclination  such  as  that  which  the  side  of  a  heap  of  coals  would  naturally 
take.  Coals  are  poured,  through  openings  above,  upon  this  combination 
of  wall  and  grate,  and,  being  fired  at  the  under  surface,  they  burn  at  the 
place  where  the  air  enters ;  but  as  the  layer  of  coal  is  from  two  to  three 
feet  thick,  various  operations  go  on  in  those  parts  of  the  fuel  which  cannot 
burn  for  want  of  air.  Thus  the  upper  and  cooler  part  of  the  coal  produces 
a  large  body  of  hydrocarbons  ;  the  cinders  or  coke  which  are  not  volatilized, 
approach,  in  descending,  toward  the  grate;  that  part  which  is  nearest  the 
grate  burns  with  the  entering  air  into  carbonic  acid,  and  the  heat  evolved 
ignites  the  mass  above  it ;  the  carbonic  acid,  passing  slowly  through  the 
ignited  carbon,  becomes  converted  into  carbonic  oxyd,  and  mingles  in  the 
