(M295) “Curious mythological beasts are also said to inhabit both land and sea, but to become visible only on special occasions. These ideas furnish material upon which their fancy works, conjuring up strange forms that are usually modifications of known creatures. It is also believed that in early days all animate beings had a dual existence, becoming at will either like man or the animal forms they now wear. In those early days there were but few people; if an animal wished to assume its human form, the forearm, wing, or other limb was raised and pushed up the muzzle or beak as if it were a mask, and the creature became manlike in form and features. This idea is still held, and it is believed that many animals now possess this power. The manlike form thus appearing is called the _inua_, and is supposed to represent the thinking part of the creature, and at death becomes its shade. Shamans are believed to have the power of seeing through the animal mask to the manlike features behind. The ideas held on this subject are well illustrated in the Raven legends, where the changes are made repeatedly from one form to another. (M296) “Masks may also represent totemic animals, and the wearers during the festivals are believed actually to become the creature represented or at least to be endowed with its spiritual essence. Some of the masks of the lower Yukon and the adjacent territory to the Kuskokwim are made with double faces. This is done by having the muzzle of the animal fitted over and concealing the face of the _inua_ below, the outer mask being held in place by pegs so arranged that it can be removed quickly at a certain time in the ceremony, thus symbolizing the transformation. Another style of mask from the lower Kuskokwim has the under face concealed by a small hinged door on each side, which opens out at the proper time in a ceremony, indicating the metamorphosis. When the mask represents a totemic animal, the wearer needs no double face, since he represents in person the shade of the totemic animal. “When worn in any ceremonial, either as a totem mask or as representing the shade, _yu-ă_ or _tunghâk_, the wearer is believed to become mysteriously and unconsciously imbued with the spirit of the being which his mask represents, just as the namesakes are entered into and possessed by the shades at certain parts of the Festival to the Dead....(857) “Mask festivals are usually held as a species of thanksgiving to the shades and powers of earth, air, and water for giving the hunter success. The _inuas_ or shades of the powers and creatures of the earth are represented that they may be propitiated, thus insuring further success.”(858)