Egyptian and Greek examples where whole species of animals, plants, or things, stand as symbolic of, and as protected by, particular deities. The thought appears with most perfect clearness in the Rabbinical philosophy which apportions to each of the 2100 species, of plants for instance, a presiding angel in heaven, and assigns this as the motive of the Levitical prohibition of mixtures among animals and plants.[1] The interesting likeness pointed out by Father Acosta between these crude theological conceptions and the civilized philosophical conceptions which have replaced them, was again brought into view in the last century by the President De Brosses, in comparing the Red Indians' archetypes of species with the Platonic archetypal ideas.[2] As for animals and plants, the desire of naturalists to ascend to primal unity to some extent finds satisfaction in a theory tracing each species to an origin in a single pair. And though this is out of the question with inanimate objects, our language seems in suggestive metaphor to lay hold on the same thought, when we say of a dozen similar swords, or garments, or chairs, that they have the same pattern (patronus, as it were father), whereby they were shaped from their matter (materia, or mother substance).