on brood-division (multiple cell-division), [16] n.;
on dual force of dividing cell, [26] n.;
on syngamy, etc., [34] n.;
and Dixon, on pepsin in Pelomyxa, [16]
Harvey, "omne vivum ex ovo," [42]
Hauerina, [59]
Heart, of Asterias rubens, [450]
Heart-urchins = Spatangoidea, q.v.
Heat—see Temperature