—— origin of, [iv. 67].
—— universal, [iv. 67].
—— English, 100,000 words in, [iv. 68].
—— classification of, [iv. 72].
—— made by convention, [iv. 73].
—— three conditions of, [iv. 78].
—— RR for 1st stage, [iv. 79].
—— R + ρ for 2d stage, [iv. 79].
—— ρ for 3d stage, [iv. 79].
—— not highly developed, rich in words, poor in general expressions, [iv. 122].