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1922.] Indian Science Congress. LS8.C. 63 
Moreover when a little of sulphuric acid is added to a 
solution of calcium or strontium or barium chloride containing 
ferric or chromium or aluminium salt the precipitated sul- 
phates of calcium, strontium or barium contain iron or alumi- 
nium or chromium. Similarly lead sulphate is precipitated 
along with barium sulphate even in presence of a large excess 
of ammonium acetate. 
Magnesium oxalate is precipitated with barium or stron- 
tium or calcium oxalate in presence of an excess of ammonium 
chloride and ammonia. 
These facts make it clear that the phenomenon of induced 
precipitation is of very general occurrence. 
n e copp muc 
more quickly because the inductor nitrous acid remains in 
Co .... contact with the copper in the tube at rest, 
a Nitric J hilst in the other case, the inductor is 
diluted throughout the whole mass of nitric 
acid. 

.g. mercuric chloride, by sodium arsenite. [se 
gated other changes as for instance the de omposition of un- 
stable substances. It is well known that 
Potassium chlo. ammonium dichromate decomposes readily 
bichro mee ot se otassium chlorate 
ichr ; 
tassiom rele that in presence of decomposing ammonium 
vere dichromate or potassium persulphate the 
d osition temperature of potassium 
chlorate is appreciably lowered. In this connection it will oe 
of interest to investigate whether the presence of an easils 
decomposable explosive will lower down the ene 8A 
temperature of a difficultly decomposable explosive, and this 
investigation will throw light on the velocity of decomposition 
of mixed explosives. 
