The priests were extremely scrupulous in the care of their persons. They bathed twice by day and twice by night, and shaved the entire body every third day. Their inner clothing was linen, woollen garments being thought unclean; their diet was plain and even abstemious, in order that, as Plutarch says, "their bodies might sit light as possible about their souls." Next to the priesthood in rank and honor stood the military order. Like the priests, the soldiers formed a landed class. They held one third of the soil of Egypt. To each soldier was given a tract of about eight acres, exempt from all taxes. They were carefully trained in their profession, and there was no more effective soldiery in ancient times than that which marched beneath the standard of the Pharaohs. THE CHIEF DEITIES.--Attached to the chief temples of the Egyptians were colleges for the training of the sacerdotal order. These institutions were the repositories of the wisdom of the Egyptians. This learning was open only to the initiated few. The unity of God was the central doctrine in this private system. They gave to this Supreme Being the very same name by which he was known to the Hebrews--_Nuk Pu Nuk_, "I am that I am." [Footnote: "It is evident what a new light this discovery throws on the sublime passage in Exodus iii. 14; where Moses, whom we may suppose to have been initiated into this formula, is sent both to his people and to Pharaoh to proclaim the true God by this very title, and to declare that the God of the highest Egyptian theology was also the God of Abraham, of Isaac, and of Jacob. The case is parallel to that of Paul at Athens."--Smith's _Ancient History of the East_, p. 196, note.] The sacred manuscripts say, "He is the one living and true God,... who has made all things, and was not himself made." The Egyptian divinities of the popular mythology were frequently grouped in triads. First in importance among these groups was that formed by Osiris, Isis (his wife and sister), and Horus, their son. The members of this triad were worshipped throughout Egypt. The god Set (called Typhon by the Greek writers), the principle of evil, was the Satan of Egyptian mythology. While the good and beneficent Osiris was symbolized by the life-giving Nile, the malignant Typhon was emblemized by the terrors and barrenness of the desert. [Illustration: MUMMY OF A SACRED BULL. (From a photograph.)] ANIMAL-WORSHIP.--The Egyptians regarded certain animals as emblems of the gods, and hence worshipped them. To kill one of these sacred animals was adjudged the greatest impiety. Persons so unfortunate as to harm one through accident were sometimes murdered by the infuriated people. The destruction of a cat in a burning building was lamented more than the loss of the property. Upon the death of a dog, every member of the family shaved his head. The scarabæus, or beetle, was especially sacred, being considered an emblem of the sun, or of life.