Miscellaneous  Results  from  the  Laboratory.  769 
Analysis  of  Box  Manure. 
Analysis 
of  the  Ash. 
Analysis 
of  the 
Manure  itself. 
Water  .... 
• • 
72-330 
Organic  Matter  . . . 
• • 
21-800 
Silica  .... 
27-90 
1-637 
Phosphoric  Acid  . 
5-11 
•299 
Sulphuric  Acid  . 
Ml 
•065 
Carbonic  Acid  . 
•95 
•055 
Lime  .... 
14-41 
•845 
Magnesia  .... 
2-40 
•140 
Oxide  of  Iron  and  Alumina 
7-81 
•458 
Potash  .... 
11-79 
•692 
Soda  .... 
2-05 
•120 
Chloride  of  Sodium  . 
3 -82 
•224 
Sand  and  Clay  ... 
21-80 
1-279 
99-15 
99-944 
The  quantity  of  nitrogen  in  the  manure  was  found  in  two 
experiments  to  be 
1st  experiment  . . *47  per  cent. 
2nd  „ . . -45  „ 
Mean  „ . . ’46  „ 
which  is  equal  to  *56  per  cent,  of  ammonia.  By  distillation  of 
the  manure  with  potash  the  quantity  of  ammonia  actually  existing 
as  such  was  found  to  be  ’02  per  cent.,  a circumstance  which 
seems  to  indicate  that  the  fermentation  in  well  ordered  boxes  is 
very  small. 
In  the  dry  manure  the  straw  was  separated  from  the  dung  by 
means  of  a fine  sieve,  and  their  relation  was  found  to  be  as 
follows  : — 
Dung  . . . 58 ‘3  per  cent. 
Straw  . . . 41-7  ,, 
Seicer  Water. — The  sewers  of  London  and  other  large  towns 
receive  the  solid  and  liquid  excrements  of  a large  portion  of  the 
population — *the  soapsuds  and  other  waste  of  the  houses,  and  the 
waste  liquors  of  all  sorts  of  manufactures — indeed  the  variety  of 
sources  which  contribute  to  the  foul  current  is  unlimited.  It  is 
the  great  object  of  the  present  system  of  sewerage,  by  an 
abundant  supply  of  water,  afforded  partly  to  the  houses  and 
partly  used  for  flushing  the  sewers  themselves,  to  carry  down  the 
mass  of  solid  and  liquid  filth  to  the  nearest  outlet  by  which  it  may 
find  its  way  to  the  great  ocean. 
Now  when  it  is  considered  how  different  is  the  composition  of 
the  food  eaten  by  the  various  classes  of  the  population ; how 
variously  that  population  is  distributed — here  a rich  square  with 
a limited  number  of  inhabitants — there  a squalid  and  crowded 
court;  when  it  is  remembered  that  the  manufacturing  portions 
