J. Conder came to Japan in 1877 as a hired foreigner, was involved in the design of more than 100 architectural works until his death in 1920, and he also conducted a number of surveys and proposals for earthquakes that frequently occur in Japan, earthquake resistance of buildings, and geological surveys. However, there has been no report of earthquake countermeasures on the design surface performed by Conder. By the way, Conder made the following reference in his speech given under the title of “The Practice of Architecture in Japan” at the 3rd regular meeting of Zoka-gakkai held on July 14, 1886. In other words, in this speech, he avoids the use of the following as an earthquake countermeasure in the design of brick buildings.

 1) projecting cornices

 2) ornamental parapets

 3) corbelled turrets

 4) non-circular arches

 And he used iron bands for the arches. There are four problems that Condor points out as "avoidance" in design. Did Condor actually "avoid" these points when designing in Japan? There has been no study on that point. The purpose of this article is to clarify the effects of the earthquake on the design aspect of the architectural works by Condor up to 1886, when the speech was made, and in the Meiji 20's. The following points were clarified.

 In the works made by Conder until 1886, 1) cornice was used consistently, 2) there was no parapet, and 3) the turret was limited to the Ueno Museum and Tokyo Fukkastu Daisedo. In addition, 4) non-circular arches were confirmed in 10 cases, and 8 cases were implemented.

 Looking at Condor's discourse on earthquake countermeasures, in the "A Few Remarks upon Architecture" written in 1878 immediately after coming to Japan, it was just a warning about the earthquake, but in "Zoka Hikkei" after 1882, he described the need for careful closeness as an earthquake countermeasure for cornice and parapets.

 In Conder's work of the 10th year of the Meiji era, it was common for the tie beam to be placed on the upper part of a brick wall and the cornice was placed in front of it, but after 1892, the tie beam was placed on the cornice. With such an arrangement, the cornice will not be pushed out from the back by the tie beam during an earthquake. The timing of the change can be judged to be the Nobi earthquake in 1891.

This article reported the manuscript of a speech at the opening ceremony of the Rokumei-kan on November 28, 1883 by J. Conder, which had not been reported previously. In addition, both English and Japanese newspaper reports were made for this manuscript. The speech by Conder was content that consciously considers the Imperial Palace building which proceeded at the same time as the Rokumei-kan, and it ended in frustration.

 Yagasaki Zentaro has already conducted a series of research on Izyuin Kanetune. In these researches, it became clear about the late life when Izyuin was active as the Suki-mono, but the footsteps of the first half of "modern engineers" are not yet clear. In addition, Yagasaki used "Koikokaishin-roku" of Kuroda Tengai and "Meiji-kako-tyo" when showing Izyuin, but there are also multiple other records and articles of interviews with him. Therefore, this paper presented the report on Izyuin by Yagasaki, and examined the matters in the first half when Izyuin was active in the government and business circles, in particular, the purpose is to clarify the relationship between the Doboku-kentiku-gumi, the Nihon-doboku-kaisya and Izyuin. The Doboku-kentiku-gumi was also known as the construction of the Rokumeikan designed by Condor. The following points were clarified, focusing on the first half when Izyuin was active in government and business circles.

 Izyuin built the Zisin-no-ma in a residence in Kagoshima as a teenager. He also constructed a steam bath for six days and was dispatched to Edo as the reward. In 1868 at Bosin-no-eki, he served as the military detective in Edo, and he was dispatched to Oshu, then he sent the injured to Yokohama and bought the weapon. Izyuin worked as the Goyo-kakari of Kanagawa Prefectural from May to November 1868, and once returned to Kagosima, he moved to Tokyo again and opened a kimono store. His work at the Miyauchi Office was from 1871 to 1872 and his service to the Navy was from around 1872 to 1887, and work at the Ministry of Industry until around the end of 1878. After he retired from the government, he belonged to the Doboku-youtasi-gumi and built the Rokumeikan. Izyuin who was closely related to Ookura Kihachi through the Doboku-youtasi-gumi, took office as Tokyo resident accountant when the Nihon-doboku-kaisya was established in 1887. And Izyuin was also related to the Sangu-tetudou-kaisya, Iris Co., Dai-Nihon-seihun, Tokyo-gekizo-kaisya and so on. As the diplomat, he sold arms to the Army at Okuragumi in 1889-94. As his houses, Nakahashi-Suzuki-cho, Shibata-cho 8-chome, Shiba-Isarako-tei, Sakyragawa-tei, Kamakura's villa in later years, and the residence of Shiba Park which was the end of the land are newly confirmed.

 It has long been known that Josiah Conder set up his office in Yokohama and actively engaged in building activities, the outline has already been published in 1995 by Yurika Munakata et al. In this paper, they called the era when Conder was active in Yokohama as the “Yokohama jidai” and showed the actual state of the Conder’s seven works that were constructed. They also showed that his office was located at No. 60 in Yamashita-cho and No. 55 in Yamashita-cho, and reported on the actual state of activities at Conder’s Yokohama Office. Takeyoshi Hori showed the following in "Kyoryu-chi kenchiku-ka toshiteno Conder" in "Gaikokuzin kentiku-ka no keifu " compiled in 2003. Conder published the advertisement for the establishment of his Yokohama office on February 26, 1897 in an English newspaper published in Yokohama, he also assigned Japanese staff such as Shinnosuke Tahara, Junichi Chika and Shunzo Minowa to his office. In addition, Hori listed the work that Conder did in Yokohama from Shinnosuke Tahara's “CV”. By the way, Munakata vaguely assumed that the Conder's “Yokohama jidai” was in the Meiji 30 (1897) period, and his Yokohama office opened around 1899 to 1902. On the other hand, Hori set the time when 's Yokohama office was opened in February 1897 from the advertisement, but does not specifically indicate the end of the “Yokohama jidai”. Therefore, this article considers the period during which Conder established his Yokohama office from the trends of the staff and Conder itself, and the purpose of this article is to clarify the period and background of activities in Yokohama by Conder, the following points are revealed.

 There were 14 works that Conder had worked in Yokohama, including incomplete works. Conder's Yokohama office was founded by the end of September 1896 based on Tahara's resume. The closing time can be judged to be around March 1903 based on the trend of the staff. The design of Conder's mansion began in April 1901, the second time of his return to the UK, and the staff member Shinnosuke Tahara was involved in the design. Conder's Yokohama office suffered a fire on March 12, 1902 and lost many drawings.