On Growth and Form,

adsorption Ammonites angle animal arrangement axis becomes body bubbles catenoid cell cell-wall centre centrosome chemical colloid cone configuration constant curvature curve cylinder diagram dimensions direction drop edges energy equal equiangular spiral equilibrium figure film flagellum fluid follows Foraminifera forces grow hexagonal horn increase increments instance Journ layer length less linear lines liquid logarithmic spiral magnitude mathematical matter mean curvature means mechanical membrane molecular nature Nautilus operculum organism particles partition phenomena phenomenon phyllotaxis physical physiological plane polar portion pressure problem Proc protoplasm Radiolaria radius rate of growth ratio Raymond Pearl recognise result septa shell shew shewn side similar simple solid solid of revolution species spermatozoon sphere spherical spicules stature structure substance successive surface surface-energy surface-tension symmetry temperature tend tension tetrahedron tissue triangle Ueber unduloid varies various velocity walls weight whole whorls