Whatever their course in the instances cited and in many

others, reversals in the processes of development do take
place
Whatever their course in the instances cited and in many
others, reversals in the processes of development do take
place. In perhaps their simplest form these can be seen in egg
cells. The development of a fragment of an egg as a complete
whole involves reversals in the processes of differentiation of
a very subtle order. The fusion of two eggs to one involves
similar readjustments. Such phenomena have been held to be
peculiar to living machines only. Yet it may be pointed out
that there are counterparts of both in the behavior of
so-called liquid crystals. When liquid crystals of
paraazoxyzimtsaure-Athylester are divided, the parts are
smaller in size, but otherwise identical with the parent
crystal in form, structure and optical properties. The fusion
of two crystals of ammonium oleate forming a single crystal of
larger size has also been observed. Though changes in
equilibrium that accompany such behavior of liquid crystals are
undoubtedly very much simpler than the changes that accompany
the regulatory processes exhibited by the living egg, the
striking resemblance between the phenomena themselves tempts us
not to magnify the difference.


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