106 Land Magnetic Observations, 1905-10 



and I in Zanzibar in all 123. The total number of stations was 348, a number rendered possible 

 by the plan adopted of taking observations at each camping-place. In addition to the results 

 obtained on this expedition, the observations at 15 stations occupied during June and July, 1908, 

 in the Cape Province, Natal, and the Transvaal have been embodied as well as other observations 

 at 18 stations in the Cape Province in January and February, 1907. 



Much of the information was obtained in various parts of Africa for the first time and also 

 valuable results have been secured for the secular variation of the elements in many regions, more 

 particularly in Africa south of the Zambezi and along the east coast of the continent. The large 

 annual change in the latter region is particularly interesting. 



While making the preliminary arrangements for the journey, the observers received great as- 

 sistance from the then Governor of the Colony of the Cape of Good Hope, Sir Walter Hely Hutchin- 

 son, who communicated with the authorities of the territories it was proposed to survey and ob- 

 tained permission for the observers to enter them and to enjoy special privileges while there. 



In German Southwest Africa the authorities allowed the observers to travel free of charge 

 over the Government railways; the same privilege was extended by the Cape, the Central South 

 African, and the Uganda railways; concessions were also granted on the Sudan and on the Egyptian 

 Government steamers and railways, and great help was received from various members of the 

 staff at Helwan and at Kew. In addition the courtesy and hospitality of the English and the 

 German officials did much to relieve the tedium and strain incident to work of this nature. 



The reduction of the results has been carried out at Washington under the Director of the 

 Department of Terrestrial Magnetism by Messrs. J. A. Fleming and H. W. Fisk. 



