The third order of gods are the children of the second series, and are manifestations of the Divine in the outward universe. But though standing lowest in the scale, they were the most popular gods of the Pantheon; had more individuality and personal character than the others; were more universally worshipped throughout Egypt, and that from the oldest times. "The Osiris deities," says Herodotus, "are the only gods worshipped throughout Egypt." "They stand on the oldest monuments, are the centre of all Egyptian worship, and are perhaps the oldest original objects of reverence," says Bunsen. How can this be if they belong to a lower order of Deities, and what is the explanation of it? There is another historical fact also to be explained. Down to the time of Ramses, thirteen hundred years before Christ, Typhon, or Seth, the God of Destruction, was the chief of this third order, and the most venerated of all the gods. After that time a revolution occurred in the worship, which overthrew Seth, and his name was chiselled out of the monuments, and the name of Amun inserted in its place. This was the only change which occurred in the Egyptian religion, so far as we know, from its commencement until the time of the Cæsars.[191] An explanation of both these facts may be given, founded on the supposed amalgamation in Egypt of two races with their religions. Supposing that the gods of the higher orders represented the religious ideas of a Semitic or Aryan race entering Egypt from Asia, and that the Osiris group were the gods of the African nature-worship, which they found prevailing on their arrival, it is quite natural that the priests should in their classification place their own gods highest, while they should have allowed the external worship to go on as formerly, at least for a time. But, after a time, as the tone of thought became more elevated, they may have succeeded in substituting for the God of Terror and Destruction a higher conception in the popular worship. The myth of Isis and Osiris, preserved for us by Plutarch, gives the most light in relation to this order of deities.