Amllfg0usrt■,f8^f.ruJ•}    Recent  Literature  Relating  to  Pharmacy.  407 
glass  of  warm  milk  with  a  little  alcohol  in  it,  the  sweating  will  be 
greatly  reduced,  and  it  will  not  have  the  same  demoralizing  effect 
upon  him.  In  this  way  you  get  a  little  extra  food  into  the  patient, 
and  at  the  same  time  prevent  the  prostration  which  is  associated 
with  this  sweating. 
The  secret  of  feeding  tuberculous  patients  is  to  give  them  light 
and  nutritious  food,  and  food  which  is  easily  digestible,  feeding  them 
"  early  and  often." 
The  article,  which  should  be  read  in  its  entirety,  is  contained  in 
the  Medical  News,  May  7,  1898. 
RECENT  LITERATURE  RELATING  TO  PHARMACY. 
THE  LIQUEFACTION  OF  HYDROGEN  AND  HELIUM. 
.  In  a  paper  entitled  "The  Liquefaction  of  Air  and  Research  at  Low 
Temperatures"  [Proc.  Chem.  Soc,  1895,11,  221),  an  account  was 
given  by  James  Dewar,  LL.D.,  F.R.S.,  of  the  history  of  the  hydrogen 
problem  and  the  result  of  the  author's  experiments  to  the  end  of  the 
year  1895.  The  subject  was  again  discussed  in  a  lecture  on 
"New  Researches  on  Liquid  Air "  (Proc.  Roy.  Inst.,  1896,15, 
i,  144),  and  a  sketch  given  of  the  apparatus  employed  for  the  pro- 
duction of  a  jet  of  hydrogen  containing  liquid.  It  was  shown  that 
such  a  jet  could  be  used  to  cool  substances  below  the  temperature 
which  could  be  reached  by  the  use  of  liquid  air,  but  all  attempts  to 
collect  the  liquid  in  vacuum  vessels  failed.  The  type  of  apparatus 
used  in  these  experiments  worked  well,  so  it  was  resolved  to  con- 
struct a  much  larger  liquid-air  plant,  and  to  combine  with  it  circuits 
and  arrangements  for  the  liquefaction  of  hydrogen.  This  apparatus, 
admirably  constructed  by  the  engineers,  Messrs.  Lennox,  Reynolds 
and  Fyfe,  took  a  year  to  build,  and  many  months  were  occupied 
in  testing  and  making  preliminary  trials.  The  many  failures  and 
defeats  need  not  be  detailed. 
On  May  10th,  hydrogen  was  liquefied  by  allowing  gas,  cooled  to 
—  205 °,  and  under  a  pressure  of  180  atmospheres,  to  escape  con- 
tinuously at  the  rate  of  from  10  to  15  cubic  feet  per  minute  from 
the  nozzle  of  a  coil  of  pipe  in  a  double  silvered  vacuum  vessel  of 
special  construction,  surrounded  with  a  space  kept  below  —  2000. 
Liquid  hydrogen  commenced  to  drop  from  this  vacuum  vessel  into 
another  doubly  isolated  by  being  surrounded  with  a  third.    On  this 
