sub porphyritic

containing smaller and le distinctly marked points or crystals. IMG:content-0471.png:[blocks in formation] Nat. Science : A grade immediately below a species. In the case of plants sub-species are often "Now if we reflect on the weighty arguments above given for raising the races of men to the dignity of species, and the insuperable difficulties on the other side in defining them, it seems that the term sub - species might here be used with propriety. But from long habit the term 'race' will, perhaps, always be employed."- Dar win: Descent of Man (ed. 2d), p. 175.