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sanitary reason for this practice. Another early custom was that a newly built house should be provided for each couple that married. It is on account of such customs that we find the Imperial capitals so frequently removed from one site to another in ancient days. The rebuilding, every twenty years, of Ise Temple, the supreme shrine of the Sun-Goddess, is an example of one of these ancient rites which still obtain at the present day. The observance of these customs was only possible with some such form of construction as that furnished by our system of wooden architecture, easily pulled down, easily built up. A more lasting style, employing brick and stone, would have rendered migrations impracticable, as indeed they became when the more stable and massive wooden construction of