Observers' Field Reports 67 



This gives an average total travel of 813 miles per station and an average field travel 

 of 99 miles per station. Owing to the delays and difficulties of transportation, it required 

 on the average 5 days per station. 



Judging from the results of j\Ir. Schmitt's trip to Masisea the region traversed was 

 highly disturbed, while the region covered in Bolivia should be fairly normal, the stations 

 being at some distance from the main ranges of the Andes, with the exception of Potosi 

 and Huarnonia. Highly magnetic black sand was found at Mollendo intermixed with 

 common sand of the coast. 



The officials of Peru were very courteous and did everything possible to facilitate the 

 work of the expedition. The official through whom all the negotiations were conducted 

 was Sr. G. Cisneros y Raygada, Introductor de Ministros, Ayacucho 428, Lima, Peru, who 

 showed in various ways his interest in the object of the expedition. 



D. W. Berky, on Magnetic Work in Morocco, Gambia, Sierra Leone, and French 



Guinea, March to August 1912. 



In pursuance of instructions of March 13, 1912, I left New York March 17, 1912, and 

 arrived at Gibraltar March 27, where I joined my chief of party, Mr. W. H. Sligh, for 

 instruction in field work and definite assignment of duty. As equipment I carried the 

 following: magnetometer No. 13; dip circle No. 223, needles 1, 3, 5, 6; pocket chronometer 

 No. 260; Howard watch No. 820; observing-tent No. 17, with a lot of miscellaneous equip- 

 ment. 



On March 28 Mr. Sligh and I proceeded to Tangier, Morocco. Here, in the interval 

 between March 28 and April 5, a caravan expedition across northwest Morocco via Fez 

 and Rabat was decided on by Mr. Sligh. On April 5-6 a station was occupied at Tangier 

 by Mr. Sligh, also a practice station by myself. Mr. Sligh considered it advisable to return 

 to Gibraltar to equip for the caravan trip to Fez. On April 9 we returned to Gibraltar. 

 On April 10, leaving Mr. Sligh to finish the ecjuipping, I proceeded to San Roque, Spain, 

 to reoccupy Mr. Sligh's station there for practice work. 



On April 20, having rejoined Mr. Sligh, we returned to Tangier. Arriving there it 

 was found necessary to abandon the caravan trip to Fez and Rabat because a revolt had 

 occurred at Fez and about 300 Europeans had been massacred. Changing plans at once, 

 Mr. Sligh decided to establish stations at the Moorish ports open to steamers. Rough 

 weather, rendering the bar in the Tangier harbor impassable, kept us prisoners till May 1, 

 when we left Tangier by steamer, arriving at Laraish on May 2. Here 2 stations were 

 occupied the next day, and Mr. Sligh assigned me the task of establishing stations at 

 Rabat, jNIazagan, Saffi, and Mogador, leaving instructions to rejoin him at the Canary 

 Islands, where he went to charter a sailing-vessel to establish stations on the Saharan coast. 



By traveling on a cargo-boat, and using her delaj^s to discharge and embark cargo, the 

 assignment of stations as above noted was completed without loss of tune. Mogador was 

 reached on May 22; here, on account of plague, I was held in quarantine to May 30. Las 

 Palmas, Canary Islands, was reached on June 1. Rejoining Mr. Sligh, I received instruc- 

 tions from him to take up work on the west coast of Africa, south of Dakar, and to occupy 

 as many stations as conditions of travel permitted. Thereafter I was to meet him again 

 at Algiers about September 1. There were thus established the following magnetic sta- 

 tions on the west coast of Africa: 



Leaving Mamou on August 10, I took a steamer at Conakry August 19, and traveling 

 via Boulogne and Marseille, arrived at Algiers on September 2. For an account of my 

 work thereafter, see the report on the tran.s-Saharan expedition. 



