1 Kevin Moses It is now 25 years since the study of the development
of the compound eye in Drosophila really began with a classic paper
(Ready et al. 1976). In 1864, August Weismann published a monograph
on the development of Diptera and included some beautiful drawings
of the developing imaginal discs (Weismann 1864). One of these is
the first description of the third instar eye disc in which
Weismann drew a vertical line separating a posterior domain that
included a regular pattern of clustered cells from an anterior
domain without such a pattern. Weismann suggested that these
clusters were the precursors of the adult ommatidia and that the
line marks the anterior edge of the eye. In his first suggestion he
was absolutely correct - in his second he was wrong. The vertical
line shown was not the anterior edge of the eye, but the anterior
edge of a moving wave of patterning and cell type specification
that 112 years later (1976) Ready, Hansen and Benzer would name the
"morphogenetic furrow". While it is too late to hear from August
Weismann, it is a particular pleasure to be able to include a
chapter in this Volume from the first author of that 1976 paper:
Don Ready! These past 25 years have seen an astonishing explosion
in the study of the fly eye (see Fig.
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