Hence there are tendencies even in Plato to build up the ideal world in sharp contrast to the actual world - to the half interpenetrated or half tamed world of matter.
An officer whose nature, as the event showed, was interpenetrated with the spirit of legality was a fitting servant of a revolution whose aim it was to substitute legality for personal caprice as the dominant principle of affairs.
The old schools and universities were being quietly interpenetrated by the new spirit of humanism, when the sky was suddenly darkened by the clouds of religious conflict.
Regarding heat (matiere de feu or fluide igne) as a peculiar kind of imponderable matter, Lavoisier held that the three states of aggregation - solid, liquid and gas - were modes of matter, each depending on the amount of matiere de feu with which the ponderable substances concerned were interpenetrated and combined; and this view enabled him correctly to anticipate that gases would be reduced to liquids and solids by the influence of cold and pressure.
Further complications arise when the lower walls of the mother zooid become thickened and interpenetrated with solenia, from which buds are developed, so that lobose, tufted, or branched colonies are formed.The chief orders of the Synalcyonacea are founded upon the different architectural features of colonies produced by different modes of budding.