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*‘dust. We have no longer to rest content with the fact that all 
“ matter is one chemically ; we have the cause.”* 
Further on he asserts that this “infinitely fine dust, finer 
“probably than anything we can imagine, becomes at last, in the 
“celestial spaces, agglomerated into meteoric irons and stones 
“with which the earth is being continually bombarded.” He 
actually speaks of the number of such masses which fall upon 
the earth every day as exceeding twenty millions. 
Now this subject of meteorites, and meteoritic dust, is not— 
as some of my hearers might suppose—altogether foreign to the 
question we have been considering. For, a few years back, one 
of our most distinguished physicists (I think it was Sir W- 
Thompson) threw out the suggestion that possibly life had been 
introduced into our world by a meteor, which in its flight 
through the celestial spaces had been arrested by ourearth. But 
if meteoric dust is continually being poured down upon the 
earth, as would seem to be the case from what Norman Lockyer 
says, surely it is far more likely (germs and dust being, as we 
have seen above, so generally found together), that fresh life is 
being brought to our earth every day—silently— and without our 
knowing anything about it. 
Moreover, I conceive that statements of this kind, by so 
eminent an observer as Norman Lockyer, go far to warrant 
much that I have said in the latter half of my paper, which 
might otherwise have appeared strange, as well as novel, to some 
of my hearers. 
* “Nineteenth Century,” Nov. 1889, ‘‘ History of a Star,” pp. 786-7 
