This is peculiar to the Roman Rite, and consists in the momentary bending of one or both knees so as to touch the earth. Genuflecting, understood in this sense, has now almost everywhere in the Western Church been substituted for the profound bowing down of head and body that formerly obtained, and that is still maintained in the East as the supreme act of liturgical reverence. It is laid down by modern authorities that a genuflexion includes every sort of inclination, so that any bowing while kneeling is, as a rule, superfluous (Martinucci, Man. Sacr. Cærem., I, i, nn. 5 and 6). There are certain exceptions, however, to this rule, in the liturgical cultus of the Blessed Sacrament. The practice of genuflecting has no claim to antiquity of origin. It appears to have been introduced and gradually to have spread in the West during the later Middle Ages, and scarcely to have been generally looked upon as obligatory before the end of the fifteenth century. The older Roman Missals make no mention of it. Father Thurston gives A.D. 1502 as the date of the formal and semi-official recognition of these genuflexions. Even after it became usual to raise the consecrated Host and Chalice for the adoration of the Faithful after the Consecration, it was long before the priest’s preceding and following genuflexions were insisted upon (see Thurston in “The Month”, Oct., 1897). The genuflexions now indicated at such words as “Et incarnatus est”, “Et Verbum caro factum est”, and the like, are likewise of comparatively recent introduction, though in some cases they replace a prostration that was usual, in ancient times, when the same sacred words were solemnly uttered (see, for instance, in regard to the “Et incarnatus”, the curious passage in the work of Radulphus Tongrensis (De can. observ.). The Carthusian custom of bending the knee, yet so as not to touch the ground, is curious; and has interest from the historical point of view as testifying to the reluctance formerly felt by many to the modern practice of genuflecting. See also the Decree of the S. Cong. of Rites (n. 3402) of 7 July, 1876, insisting that women as well as men must genuflect before the Blessed Sacrament. The simple bending of the knee, unlike prostration, cannot be traced to sources outside Christian worship. Thus, the pagan and classical gesture of adoration consisted in the standing before the being or thing to be worshipped, in putting the right hand to the mouth (ad ora), and in turning the body to the right. The act of falling down, or prostration, was introduced in Rome when the Cæsars brought from the East the Oriental custom of worshipping the emperors in this manner as gods. “Caium Cæsarem adorari ut deum constituit cum reversus ex Syria non aliter adire ausus esset quam capite velato circumvertensque se, deinde procumbens” (Suet., Vit., ii). The liturgical rules for genuflecting are now very definite.
