✍ Scribed by Shapiro, Herbert
No coin nor oath required. For personal study only.
the Marine Biological Laboratory, Woods Hole, Massachwetts NINE FIGURES Khen a living cell undergoes deforniatioii in shape owing-to an applied stress, it tends in general to return to its original conformation, once the deforming forces are removed. Familiar examples are erythrocytes squeezing through capillaries, and the distortion of a protozoan like Paramecium. Another interesting example is that of the epithelial cells of the bladder cavity, discussed in Bailey's Histology ('13, p. 70) where the shape of these cells is shown to vary with the emptying and filling of the bladder. The large egg of the snail, Busycon canaliculatum, when placccl on its side, gradually changes shape until it reaches its original equilibrium figure (Harvey, '33). The final form assumed depends upon the radius of the egg ( r ) , the surface forces (T) and the diffcreiice in density of cell and nicdiuin (dd'), such that r /g(d -a')
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