WATER  OF  THE    DELAWARE  RIVER. 
427 
At  several  times  the  Government  sent  him  money,  to  encour- 
age his  researches,  and  on  the  19  Fructidor  an  II.  (1793)  he  ob- 
tained 4000  livres  from  the  Committee  of  Public  Safety  to  meet 
the  advances  he  had  made  in  reference  to  the  project  of  which 
he  was  the  inventor.  Leblanc  was  a  man  both  of  imagination 
and  knowledge.  The  most  distinguished  men  of  his  times  pro- 
fessed for  him  a  warm  sympathy.  He  took  part  in  all  those 
liberal  associations  where  friends  of  science  resorted.  The 
government  charged  him  with  various  scientific  missions.  He 
published  various  researches  upon  nickel,  alum,  sulphate  of 
magnesia,  the  production  and  extraction  of  saltpetre,  the  chemi- 
cal preparation  of  manures,  &c,  but  he  never  realized  the  dream 
of  his  life.  In  despair,  he  destroyed  himself  on  the  15th  of 
January,  1806.  He  left  two  sons,  one  of  whom,  a  professor  in 
the  Conservatoire  of  Arts  and  Trades,  has  acquired  a  high  re- 
putation in  the  industrial  world  by  his  publications  and  the  pro- 
gress which  he  has  made  in  the  invention  of  machines. — Ameri- 
can Journal  of  Science  and  Arts. 
ON  THE  COMPOSITION  OF  THE  WATER  OF  THE  DELAWARE 
RIVER. 
By  Henry  Wurtz,  New  Jersey  State  Chemist,  etc. 
The  water  of  the  Delaware  which  was  submitted  to  analysis, 
was  collected  from  the  river  on  the  11th  day  of  September  last, 
at  a  spot  opposite  the  pump-house  of  the  Water  Works,  and  im- 
mediately over  the  grating  through  which  the  water  is  drawn  to 
supply  the  reservoir.  A  specimen  was  also  obtained  upon  the 
same  day,  of  the  water  in  the  reservoir,  for  the  purpose  of  com- 
paring the  proportion  of  foreign  ingredients  in  the  reservoir 
water,  with  that  in  the  river  water.  The  spring  water  analysed 
was  obtained  some  days  later,  from  one  of  the  tanks  from  which 
the  city  was  formerly  supplied,  in  the  rear  of  the  residence  of 
Mr.  Closson. 
The  proportion  of  solid  matter  found  in  the  several  waters  was 
as  follows : 
Grains. 
In  one  gallon  of  Delaware  water,  .....  3.5346 
la  one  gallon  of  the  reservoir  water,  .....  3.8555 
In  one  gallon  of  the  spring  water,   3.6077 
