[Gnomermind-devel] Ction. In communicating itself, the impetus splits up more an

[Kishel L. <phi...@ak...>]

Ontinuously exerted in the same direction, and not, as Darwin held, by
accidental variations. His theory rests on observations of the highest
interest, of which the starting-point was the study of the course
followed by the color variation of the skin in certain lizards. Before
this, the already old experiments of Dorfmeister had shown that the same
chrysalis, according as it was submitted to cold or heat, gave rise to
very different butterflies, which had long been regarded as independent
species, _Vanessa levana_ and _Vanessa prorsa_: an intermediate
temperature produces an intermediate form. We might class with these
facts the important transformations observed in a little crustacean,
_Artemia salina_, when the salt of the water it lives in is increased or
diminished.[32] In these various experiments the external agent seems to
act as a cause of transformation. But what does the word "cause" mean
here? Without undertaking an exhaustive analysis of the