Extracts from Field Reports 119 



merits, before and after his field work, with those at Apia, Christchurch, Sydney, and Melbourne. 

 The instruments used by him were courteously lent by the Apia Observatory; the observer-in- 

 charge, Dr. Franz Linke, also gave Mr. Heimbrod the necessary instruction in observing. Mr. 

 Heimbrod's stations were distributed as follows: Cook Island, 2; Samoan Islands, i; Fiji Islands, 

 9; Society Islands, 3; Tuamotu Islands, 2; New Zealand and Australia, 6. Much of the trans- 

 portation was effected by small sailing vessels. His work was greatly facilitated by the numerous 

 courtesies extended by the governors of the various islands visited. 



L. A. Bauer, E. H. Boweji, and P. H. Dike. In order to furnish data for the northward 

 extension of the magnetic charts of the United States Messrs. Bauer, Bowen, and Dike, in Sep- 

 tember and October, 1906, determined the three magnetic elements at about 70 uniformly dis- 

 tributed stations in southern Canada between meridians 75 and 105 west. As the region 

 was covered by Lefroy in his magnetic survey of 1842-44, important secular-variation data besides 

 distribution results were obtained. 



/. P. Ault. During December, 1906, to the early part of February, 1907, Mr. Ault made 

 magnetic observations in Mexico at 17 stations, and secured comparisons with the standards 

 of the Mexican Survey at the observatory at Cuajimalpa as also at Monterey. 



C. K. Edmunds. The work for a general magnetic survey of China was begun by Dr. Edmunds 

 in January, 1906, on Hainan Island. The instrumental outfit consisted of a Kew dip circle and 

 a Kew magnetometer, with theodolite and tripods, kindly lent by the Hongkong Observatory, 

 together with accessories supplied by the Department of Terrestrial Magnetism. The dip circle 

 and magnetometer were standardized at the Hongkong Observatory both before and after field 

 work. During the months of January and February, 8 stations were occupied on Hainan Island, 

 in a region magnetically unexplored, and at some points which had never before been visited by a 

 white man. In May, 1906, an outfit of small French instruments was borrowed from the Zi-ka-wei 

 Observatory, through the courtesy of Director Le Froc, and compared at the Hongkong Ob- 

 servatory with the Kew instruments used in the early part of the year. With these small instru- 

 ments a magnetic survey was made along the coast from Swatow northward during June, July, 

 and August, 12 stations being occupied. At irregular times during the year, as opportunity 

 afforded, 11 stations were obtained in the vicinity of the lights in the Chusan Archipelago and 

 in the neighborhood of Chefoo, Tientsin, and Naichwang. Between November, 1906, and 

 January, 1907, comparison observations were made at Hongkong and Honglok, and during 

 February, 1907, magnetic observations were made at Honglok, Yeungkong, Kochow, and Foochow. 

 A new outfit of instruments was supplied by the Department of Terrestrial Magnetism in 1907 

 and compared with the Kew and French instruments used in the previous work. During August 

 to December, 1907, and between October i and December 15, 1908, about 35 stations were occupied 

 in the provinces of Kiangsi, Kiangsu, Shantung, Chihli, Shengking, Honan, and Hupeh, thus 

 completing a fairly detailed survey of the southeastern part of China, between approx- 

 imately the meridians 113 and 122 east and parallels 22 and 42 north. On October i, 

 1910, a campaign was initiated for extending the magnetic work into the provinces of Kwangsi 

 and Yunnan and into Indo-China. Since the work is still in progress, a detailed report is at 

 present deferred. As Dr. Edmunds is president of the Canton Christian College at Honglok, 

 he has been able to give only a part of his time to the work about three to four months each 

 3'ear. The total number of his stations up to 1910 was about 100, a number of which were repeat 

 stations. 



/. C. Pearson and W. H. Sligh. In pursuance of instructions, Mr. Pearson left Washington 

 the latter part of February, 1908, for Constantinople, stopping en route at the Kew Magnetic 

 Observatory, for comparisons of his instruments with the Kew standards. Upon arrival at Con- 

 stantinople, he determined the magnetic elements at a station in the grounds of Robert College 

 and then proceeded to Egypt, securing observations at Port Said, Suez, Alexandria, and com- 

 parisons at the Helwan Magnetic Observatory near Cairo. After the work in Egypt, he returned 

 to Constantinople and then entered on the trip to Persia, via Tiflis, Russia. Observations were 

 made at Alexandropol, Erivan, Nakhitchevan, and Batum, and comparisons were secured at 

 the Tiflis Magnetic Obser\'atory. Persia was entered at Khoi, on the northern frontier, and 

 magnetic observations were made at Khoi, Tabriz, and Teheran, also at 4 stations between Tabriz 

 and Teheran. The work was continued from Teheran mainly by camel caravan, but owing to 

 unsettled political conditions there were numerous delays. Altogether 13 stations were occupied 



