MANUFACTURING  PRUSSIATE  OF  POTASH., 
79 
A  gun-barrel  was  partially  filled  with  the  mixture,  and  ex- 
posed to  a  red  heat  in  a  separate  furnace.  In  the  first  and 
second  series  of  experiments,  the  gases  generated  in  the  gun- 
barrel  were  passed  through  the  potash-charcoal  which  was  main- 
tained at  a  red  heat  in  an  iron  tube  placed  in  another  furnace. 
In  the  third  series  of  experiments,  the  gases  were  passed  through 
hydrochloric  acid,  and  in  the  last  experiments,  the  gases  escaping 
from  the  iron  tube  containing  the  potash-charcoal,  were  conveyed 
through  hydrochloric  acid  and  then  through  a  solution  of  potash. 
In  the  last  series,  the  gases  which  escaped,  were  collected  and 
analysed. 
In  each  case,  the  prussiate  was  extracted  and  crystallised. 
The  ammonia  was  determined  in  the  usual  way,  but  in  the 
tabulated  results  which  followed,  the  ammonia  is  given  in  its 
equivalent  of  crystallised  prussiate  of  potash. 
The  theoretical  yield  of  prussiate  was  382-50,  and  the  actual 
quantities  obtained,  were  as  follows  : — 
I. 
u. 
in. 
IV. 
Retort 
101-97 
135-46 
146-93 
141-08 
Tube 
68-26 
63*54 
71-00 
Acid 
140-24 
58-80 
Potash 
2-75 
Total  . 
170-22 
199-00 
287-17 
273-63 
Loss 
212-28 
183-50 
95-33 
108-87 
Produce  per  cent. 
44-5 
52*2 
751 
71-5 
The  gases  were  not  collected  until  the  air  had  been  expelled 
from  the  apparatus,  and  consisted  of — 
Hydrogen            .  .          .  4600 
Garburetted  Hydrogen  .          .          .  14-66 
Carbonic  Oxide     .  .          .          .  25-34 
Nitrogen        .  .          .          .  1400 
100-00 
It  would  therefore  appear  that  part  of  the  nitrogen  of  the 
animal  matters  is  eliminated  in  its  ultimate  form,  and  cannot  be 
made  available  in  this  manufacture.  It  would  also  appear  that 
a  modification  of  the  apparatus  uaed  by  manufacturers  would 
