268 CARNEGIE INSTITUTION OF WASHINGTON. 



In May, Observer Bradley Jones was detached from the Carnegie 

 party, and joined Mr. Wise in Peru (see page 257). After the de- 

 parture of Mr. Fleming for Washington, Observers Wise and Jones 

 set out together on an expedition to cover the northern portion of the 

 country. Leaving Lima May 16, 1917, they proceeded by rail to 

 Cerro de Pasco, and thence by horses to Huanuco, and from there, 

 partly on horseback and partly on foot, down the Huallaga River to 

 Tingo Maria, where a raft was constructed on which they continued 

 the descent for 3 days, to a point where a canoe could be obtained for 

 proceeding down the river. Their original intention had been to pro- 

 ceed together down this stream to Yurimaguas, where they were to 

 separate, Mr. Wise to take the overland route by way of Moyabamba 

 to Pacasmayo, and Mr. Jones to continue down the Huallaga River to 

 the Maranon, up that river, and west to the coast. This plan was 

 abandoned because information had been received that the route up the 

 Maranon was impracticable. Accordingly, after intercomparing the 

 two instrumental outfits, one outfit was returned to Lima and the two 

 observers proceeded together down the river, the plan now being to 

 reoccupy the C. I. W. station of 1910 at Yurimaguas, and travel thence 

 overland to Moyabamba, Cajamarca, and Pacasmayo. On account of 

 the loss on June 18, 1917, of a part of their outfit in a river accident 

 near Uchiza, they were compelled to abandon the trip further down the 

 river and return by the most direct route to Chimbote, on the coast, 

 where they arrived July 23, 1917. From here the party proceeded to 

 Lima, where Mr. Wise received instructions to return to Washington 

 and Mr. Jones was reassigned to the Carnegie at Buenos Aires. 



During the Carnegie's stay at Buenos Aires the opportunity was 

 afforded of sending out members of the party to reoccupy stations of 

 the Argentine Magnetic Survey. Accordingly Observers A. D. Power 

 and L. L. Tanguy were assigned by Captain Ault to land work, and 

 several expeditions were carried out. The first of these expeditions 

 crossed the country from west to east at about south latitude 39°, 

 beginning at Zapala and proceeding eastward by way of Bahia Blanca to 

 Buenos Aires. This was completed in April and May before the winter 

 season began. The second expedition, completed early in July, crossed 

 the country at about south latitude 33° to 34°, from Mendoza on the 

 west, eastward to Buenos Aires. The third expedition was planned 

 to cover the region from La Quiaca on the north, southward through 

 Cordoba to Buenos Aires. As Mr. Power's services were required 

 on board the Carnegie for a few weeks at this time, Mr. Tanguy was 

 instructed to undertake the work of this expedition, which he did begin- 

 ning about the middle of July. 



The land work undertaken by the Carnegie party was completed 

 about the middle of October, and comprised the reoccupations of ap- 

 proximately 60 stations. Before beginning the work, comparisons were 



