country's chief city for more than eighty years. For the first time a plan of the city was drawn, a plan very much like a checkerboard, having been modelled after the contemporary Chinese metropolis. The architectural style of the new palaces was also an imitation of that which then prevailed in China. The only difference was that wood was widely used here instead of brick, which was already the chief building material in China. Nobles were encouraged by the court to build tiled houses in place of thatched. Tiles began to come into use about that time, and not for roofing only, but for flooring also, though the checkerboard plan of the metropolitan city of Nara might never have been realised in full detail, and though among those palaces once built very few could escape the frequent fires and gradual decay, yet judging from those very few which have fortunately survived to this day, we may fairly imagine that they must have been grandiose in proportion to the general condition of the age. What gives the best clue to the social life of the higher classes of that time is the famous imperial treasury, Sho-so-in, at Nara, now opened to a few specially honoured persons every autumn, when the air is very agreeably dry in Japan. The treasury contains various articles of daily and ceremonial use bequeathed by the Emperor Shomu, who was the eldest son of the Emperor Mommu and died in 749 A.D. after a reign of twenty-five years. Being so multifarious in their kinds, and having been wonderfully well preserved in a wooden storehouse, these imperial treasures, if taken together with numerous contemporary documents extant today, enable us to give a clear and accurate picture of the social life of that time.