J. D. Dana on the Origin of Life. 389 
searches is precisely that Mr. Pasteur’s facts are inexact—not 
because his experiments were not most admirably performed, 
but simply because the magnifying power of his microscope was 
insufficient for the work to which he applied it. I desire to ap- 
pend two remarks to this paper. The first is, that the common 
a@ priori objection, which Mr. Pasteur so well expressed in his 
memoir, to heterogeny in all forms, viz. that it is a doctrine 
which has been gradually driven from all the higher forms of 
m 
the Royal Society, has already shown something like an appear- 
ance of structure in these minute objects, and leaves, I think, no 
doubt about their organic character. 
Art, XLVIIL—A word on the Origin of Life; by JAMES 
D, Dana. 
work—* Mind in Nature, or the Origin of Life, and the mode of 
development of Animals”—to which we objected in the last 
number of this Journal, and which the body of the work en- 
deavors to sustain, rests on no other basis. And his opinion of 
i 
