Summary

by various authors A Dictionary of Greek and Roman Antiquities… (1890)

HERMAE (ἑρμαῖ) , and the diminutive HERMULI (ἑρμίδια) , statues composed of a head, usually that of the god Hermes, placed on a quadrangular pillar, the height of which corresponds to the stature of the human body (ἡ τετράγωνος ἐργασία, Thuc. 6.27; τὸ σχῆμα τὸ τετράγωνον, Paus. 4.33.4) . Some difficulties are involved in the question of their origin, and of their meaning as symbols of Hermes.
Source: Wikisource

by various authors A Dictionary of Greek and Roman Antiquities… (1890)

The reason why the statues of the other deities were developed into perfect forms, while those of Hermes so generally (by no means universally) retained their ancient fashion, is obviously on account of the religious significance attached to the symbol of the pillar, as a boundary mark. Where this motive was not called into action, Hermes himself was represented in the complete human form with all the perfection of Greek art, as, for example, in his statues in the palaestrae, and in those which embodied others of his attributes.
Source: Wikisource

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