MNEMONIC.

This has been the most apparent, and probably the most ancient, purpose for which pictographs have been made. It commenced by the use of material objects which afterwards were reproduced graphically in paintings, etchings, and carvings.

In the present paper many examples appear of objects known to have been so used, the graphic representations of which, made with the same purpose, are explained by knowledge of the fact. Other instances are mentioned as connected with the evolution of pictographs, and possibly to interpret some of the latter which are not yet understood.

The quipu of the Peruvians is one of the most instructive devices for the general aid of memory, and as applicable to a variety of subjects, also having value for comparison with and reference to all other objects of this character. A good account of the quipu, quoted from Travels in Peru, during the years 1838-1842, * * by Dr. J. J. von Tschudi [Wiley and Putnam’s Library, Vols. XCIII-XCIV.], New York, 1847, Pt. II, pp. 344, 345, is as follows: