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Of grace or favor, by favor. De speciali gratia, of special grace or favor. De gratia spcciali certa scientia et mcro motu, talis clausula non valet in liis in quibus prrcsumitur principem esse ignorantem. 1 Coke, 53. The clause "of our special grace, certain knowledge, and mere motion," is of no avail in those things in which it is presumed that the prince was ignorant. De grossis arboribus decimae non da- buntur sed de sylvia credua decirna; dabuntur. 2 Rolle, 123. Of whole trees, tithes are not given; but of wood cut to be used, tithes are given.