Every race has in the course of time endeavoured, as the want of new expressions made themselves felt, to enlarge its vocabulary according to its turn of mind, or what is called its genius, either by mere agglutination or by affixes, etc. The Greeks, for example, have multiplied the number of their verbs in combining them with prepositions: the Semites seem to have followed a similar, though not identical process, which, however, has till now resisted all analysis. I propose, therefore, in this paper to examine those formatives which, with the verbal stems, have given birth to the voices. It must be remembered that the word “voice” is not used here as in the Aryan Grammars, but is. used to designate the various modifications suffered by the stem and altering its meaning.