The Andes of southern Peru . 6 Cloudiness lilKil CompletelyOvercast IHZl Clear 1123 iffl Fig. 89—Cloudiness at tlie desert station of Fig. S8 (near Caraveli), for thesummer (January to Mareli) of 1913. morning northerly winds were frequent. It is also noteworthythat the directions of the upper currents of the atmosphere as•recorded by the motion of the clouds was generally between N. andE. Plainly we are in the border region where climatic influencesare carried over from the plateau and combine their effects withthose from Pacific sources. Arequipa, farth

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The Andes of southern Peru . 6 Cloudiness lilKil CompletelyOvercast IHZl Clear 1123 iffl Fig. 89—Cloudiness at tlie desert station of Fig. S8 (near Caraveli), for thesummer (January to Mareli) of 1913. morning northerly winds were frequent. It is also noteworthythat the directions of the upper currents of the atmosphere as•recorded by the motion of the clouds was generally between N. andE. Plainly we are in the border region where climatic influencesare carried over from the plateau and combine their effects withthose from Pacific sources. Arequipa, farther south, and at analtitude of 7,550 feet, resembles Chosica. For the years 1892 to1895 its mean rainfall was inches. Besides the seasonal variations of precipitation there arelonger periodic variations that are of critical importance on theCoast Eange. At times of rather regular recurrence, rains thatare heavy and general fall there. Every six or eight years is saidto be a period of rain, but the rains are also said to occu

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Keywords: ., bookcentury1900, bookdecade1910, bookidandeso, booksubjectgeology