Work on the lines suggested by the Linnaean fragmenta was continued in France by Bernard de Jussieu and his nephew, Antoine Laurent, and the arrangement suggested by the latter in his Genera Plantarum secundum Ordines Naturales disposita (1789) is the first which can claim to be a natural system.
While there is frequent mention of the acolyte's office in the Ordines Romani, it is only in the Ordo VIII.
2 On the other hand, the Roman ordines of the 8th and 9th centuries make no mention of the mitre; the evidence goes to prove that this liturgical head-dress was first adopted by the popes some time in the 10th century; and Father Braun shows convincingly that it was in its origin nothing else than the papal regnum or phrygium which, originally worn only at outdoor processions and the like, was introduced into the church, and thus developed into the liturgical mitre, while outside it preserved its original significance as the papal 1 Father Braun, S.
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