In the old Egyptian church order, known as the Canons of Hippolytus, there are numerous directions for the service of the agape, held on Sundays, saints' days or at commemorations of the dead.
The custom of marriages between brothers and sisters, agreeable to old Persian as to old Egyptian ethics, was instituted in Egypt by the second Ptolemy when he married his full sister Arsinoe Philadelphus.
In his Practica geometriae plain traces of the use of the Roman agrimensores are met with; in his Liber abaci old Egyptian problems reveal their origin by the reappearance of the very numbers in which the problem is given, though one cannot guess through what channel they came to Leonardo's knowledge.
Of the old Egyptian freshwater canal Dicuil learnt from one "brother Fidelis," probably another Irish monk, who, on his way to Jerusalem, sailed along the "Nile" into the Red Sea-passing on his way the "Barns of Joseph" or Pyramids of Giza, which are well described.
This older order of the epistles is only found elsewhere in the Sahidic version of the New Testament, and it was probably therefore the old Egyptian or Alexandrian order.
