(B) The lower shell-stratum of Yoshii and Orimoto shell-mounds in 

 Kanagawa Prefecture contained ■ many Anadara granosa Linne, but in 

 the upper stratum there are no traces or very few of them. These facts 

 indicate that the climate and the sea-water dropped in temperature from 

 a previous warmer period. 



(C) We cannot find shell-fish such as Anadara granosa Linne, but 

 shell-fishes [Natica janthostoma Deshayes, Mactra sachalinensis Schrenck, 

 Cancellaria cond^difora Sowerby, Pecten laqueaUis Sowerby, Panope 

 japonica Adams, and Neptune arthritica Bernardi) living in cold currents 

 were discovered from shell-mounds such as Takakuneda, Miyadaira, 

 Sakura, and Komatsugawa in Ibaragi Prefecture. 



(D) The temperature of the chmate and sea-water changes again 

 and becomes warm, and Anadara granosa Linne are found in the Fumi- 

 gaoka shell-mound, Kanagawa Prefecture, the Kaminumabe shell-mound 

 in Tokyo, &c. 



(E) Shell-fishes living in cold water were taken again from the shell- 

 mounds of Kasori, Ichinomiya, and Ishigamidai in Chiba Prefecture, 

 which, from the archaeological point of view, chronologically belonged 

 to a later type of shell-mound in Japan. 



(F) Some special kinds of human clay-doll which seemed to be wearing 

 snow-goggles like Eskimos or Siberians to protect their eyes from glare 

 were found from ancient sites in the northern provinces of Japan. 



(G) Horse-chestnuts were excavated from many ancient sites. There 

 are none of such plants existing in those places at present. We can see 

 these plants in cooler places, such as in high mountains or in the northern 

 provinces. 



(H) According to the poems in " Manyo-syu," flowering season of 

 the cherry trees was seen about a week earlier than nowadays. 



(I) According to the " Taiheiki," Vol. 5, Daito-no-miya, an Imperial 

 Prince, ate rice-gruel containing ' horse-chestnuts in the mountains, 

 Nara Prefecture, where this kind of nut at present is hard to get. 



(J) " Tosha-Shinko-ki " records that Lake Suwa, Nagano Prefecture, 

 did not freeze even in the winter for eight consecutive years from 1511 

 till 1518. The cherry blossoms bloomed earlier than it does now. 



(K) " Tonegawa-zushi " (1858) and " Kii-no-kuni Meisho-zue" 

 (1851) mention and sketch these facts — namely, that sea-lions came 

 down to the south even to the coast of Chiba Prefecture all the year, 

 and to some islands of Wakayama Prefecture in the winter season. 

 According to " Setsu-yo-kikan," the water of all rivers at Osaka Province 

 became ice in the winters of 1813, 1822, and 1823. 



(L) The modern atmospheric temperature not only of Tokyo, but 

 of everj^ part of Japan, is becoming higher "than in the past, according 

 to the meteorological observations during this century. 



Then why does the seven hundred year periodicity of climatic change 

 happen ? This is a very interesting problem,. and I have found recently 

 one of the keys to give a solution to it. Since the seventh century we find 



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