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sure, clouds, precipitation, wind, 

 sea, and surface temperature of 

 the ocean. 



On the return voyage from 

 Mollendo to Panama a full series 

 of weather observations was 

 taken similar to that recorded 

 when outward bound. 



A complete series of weather 

 observations was taken at Alachu 

 Picchu and during the cross-sec- 

 tion map-making. Arrangements 

 were made with Mr. Burt Col- 

 lins, the manager of the Inca 

 Mining Company, and with Mr. 

 Claude Barber, of the Santa 

 Lucia mine, to undertake the es- 

 tablishment of four meteorologi- 

 cal stations at widely different 

 elevations along the 71st merid- 

 ian w^est of Greenwich. One will 

 be at an elevation of nearly 14.- 

 000 feet, another at an elevation 

 of about 6,000 feet, another on 

 the edge of the Great Plains, and 

 still another on the River Madre 

 de Dios. 



Self-registering barometers, 

 thermometers, and rain gauges 

 have been supplied for these sta- 

 tions. Mercurial barometers and 

 sling psychrometers have also 

 been provided. Both Mr. Collins 

 and Mr. Barber have agreed to 

 look after the maintenance of 

 the stations for a period of five 

 years. 



The instrumental equipment 

 for these stations was in part a 

 loan from the Harvard Observa- 

 tory through the kindness of 

 Prof. E. C. Pickering, and in 

 part due to the generosity of 

 Mrs. Alfred Mitchell, who placed 

 at our disposal a special fund for 

 the purchase of instruments. 



The results of the work should 

 prove most illuminating a n d 

 ought to be of particular value 

 in connection with the observa- 

 tions made some years ago by 

 the Aleteorological Department 

 of the Harvard Astronomical 

 Observatory at Arequipa. 



56: 



