Dec. 30-1927. I am walking about the Capitol Building, and am struck with the reef nature of the limestone. In places it looks like the coral gravel, and shoing hairs aligned growths like hypha- groths, also current action at the rim and torn I guess. Dr. [illegible] has in much algal or stimulated flora growth are a white felties interlaced in the left leg of the general limestone, also must Bryozoa material. Look of this lie in Japan's Sea of Japan. It is all a fine illustration of reef limestone. Later on I see that nearly all is Bryozoa material. Reef-li. of Bryozoa and algal growths. The cyptogron-like growths must be of algal nature at an intricate structure.