A polystelic con g dition arises in some members of this order by the association of collateral 8 bundles round common centres.
61° tory organs of those creatures in the con-;...« dition of projecting appendages serving =?.?
The path of a ray from the wave-surface AoBo to A or B is determined by the con dition that the optical distance, µ ds, is a minimum; and, as AB is by supposition a wave-surface, this optical distance is the same for both points.
Dition being added and the every application, not so as A whole grape.