60 EVOLUTION AND THE 
4. Living matter (in the form of 
the specks ab sve mentioned) does 
appear quickly and abundantly in 
Cituations where the uniformity of: 
natural phenomena entitles us to 
believe that no living matter 
(whether visible or invisible) could 
have pre-existed. 
In’ support of the present occur- 
rence of Heterogenesis.* 
5. Actual observation with the 
microscope of many phenomena of 
thiskind. (Vol. II., chaps. xvii., 
xix, —xxii.) 
6. The analogy between the 
phenomena of Heterogenesis and 
those of Allotropism. (Vol. IL, 
pp. 49—85.) 
7. The fact that the presence of 
certain of the lowest organisms 
within higher organisms is more 
or less determinable at will. (Vol. 
IL, pp. 317—345-) 
8. Our power of determining 
the presence of animal or plant- 
like organisms at will, in vessels 
containing certain organic infu- 
sions. (Vol. II, pp. 209—219, 
231—235.) 
4. The occurrence of Life-Evo- 
lution or Archebiosis in certain 
experimental flasks is only to be 
denied by making another assump- 
tion (as to the power of resisting 
heat displayed by living matter), 
which is not only without scien- 
tific warrant, but is in opposition 
to established facts. 
Against Panspermism and an 
exclusive belief in Homogenesis. 
5. The gratuitous assumption 
that many otherwise good ob- 
servers should all be deceived— 
simply because their interpreta- 
tions contradict the preconceived 
opinions of the majority of natu- 
ralists. 
6. The absence of all reason why 
phenomena of Allotropism should 
not show themselves with different 
kinds of living matter, as with 
simpler molecular compounds. 
7. The impossibility of explain- 
ing this, except by the disproved 
assumption that higher organisms 
are always permeated by innume- 
rable invisible and generally latent 
germs of such lowest organisms. 
8. Our power of watching all 
the stages by which these animal 
or plant-like forms are produced, 
from the “pellicle on hay infu- 
sions,” and our inability otherwise 
to account for their first appear- 
* As most of these facts have not been referred to in this commui- 
cation, I subjoin, after each pair of paragraphs, references to the 
chapters or pages in which the subject has been discussed or referred to 
in my work, ‘‘ The Beginnings of Life.” 
