THE RELATION OF THE BUOYANCY OF SEEDS AND SEEDVESSELS TO THE DENSITY
OF SEA-WATER
The general principles concerned.—The subject assumes a statistical
character.—Seeds and seedvessels are as a rule either much heavier
than sea-water or much lighter than fresh water.—The present littoral
plants with buoyant seeds or seedvessels could be equally well
dispersed by currents in oceans of fresh water.—Seed-buoyancy has no
relation either in the present or in the past to the density of the
sea.—Though an accidental attribute, the specific weight of seeds has
had a profound influence on plant-distribution.—Summary
_Pages_ 88-98