256 CARNEGIE INSTITUTION OF WASHINGTON. 



During the nine years since the Carnegie was placed in commission 

 she has cruised over 189,176 nautical miles of ocean, the daily average 

 for the 1,587 days at sea being 119 miles. Magnetic declination 

 observations were made at 2,155 stations at sea, magnetic intensity 

 observations at 1,387 stations, and inclination observations at 1,393 

 stations. 



LAND WORK. 

 AFRICA. 



On November 29, 1917, Observer H. E. Sawyer arrived at Khar- 

 toum, Anglo-Egyptian Sudan, having left El Fasher, in the Darfur, 

 on October 3, and El Obeid on November 17, thus completing a very 

 difficult overland journey, beginning at Brazzaville, near the mouth 

 of the Kongo River, and extending by way of Lake Tchad to the Upper 

 Nile Valley, and covering almost exactly a year's time. It is pleasing 

 to note that the trip was accomplished with no serious mishap and 

 that the loss of time on account of sickness was relatively small, con- 

 sidering the prevalence of tropical disease, the unavoidable exposure, 

 and the lack of suitable facilities for proper treatment. 



After a period of rest and recuperation at Khartoum, Mr, Sawyer 

 outfitted a felucca, a combination sail and row boat, for an expedition 

 southward up the White Nile, having been informed that the pre- 

 vailing north wind and moderate stage of the water at that season 

 would permit easy traveling by night with opportunity to land and 

 make observations at frequent intervals by day. However, a very 

 unusual condition of high water in the lakes at the head of the Nile 

 maintained the river at such a stage that suitable landings could not 

 be made as often as had been hoped. He left Khartoum on January 

 12, 1918, and arrived at Kodok (Fashoda) on February 4, whence he 

 proceeded to Gondokoro, Uganda, where Dr. J. C. Beattie concluded 

 his overland expedition from South Africa in 1909. Notwithstanding 

 the difficulties incident to the high water, 16 stations were occupied 

 along the Nile above Khartoum. 



On his return to Khartoum, Mr. Sawyer received an invitation from 

 a representative of the government of Eritrea, who chanced to be at 

 Khartoum at that time on business, to accompany him on his return 

 to Asmara, Eritrea, by automobile. This trip, which occupied 17 days 

 from April 25, furnished opportunity to occupy 4 intermediate sta- 

 tions between Khartoum and Asmara, one of which was Kassala, a 

 station of the Magnetic Survey of Egypt. After observing at Asmara, 

 previously occupied by Mr. W. F. Wallis, of the Department, in 1914, 

 he proceeded to Massawa and Port Sudan on the Red Sea, where 

 C. I. W. repeat stations of 1911 and 1914 were reoccupied. From 

 Port Sudan he returned by way of Musmar and Berber to the Nile, 

 and thence down the Nile to Helwan, near Cairo, occupying en route 



