136 



THE ANDES OF SOUTHERN PERU 



has died down considerably and the evenings are entirely free 

 from it. The wind action is about the same every day. It is not 

 a cold wind and, except with the fog, not a damp one, for I have 

 not worn a coat in it for three weeks. It has a free unobstructed 

 sweep across fairly level pampas. . . . At an interval of every 

 three or four days a dense fog sweeps up from the southwest, 

 dense enough for one to be easily lost in it. It seldom makes even 



Fig. 88 — Wind roses for a station on the eastern border of the Coast Desert near 

 Caraveli during the summer (January to March) of 1913. Compare with Fig. 87. 

 The diameter of the circle in each case represents the proportion of calm. Note the 

 characteristic morning calm. 



a sprinkle of rain, but carries heavy moisture and will wet a man 

 on horseback in 10 minutes. It starts about 3 p. m. and clears 

 away. by 8.00 p. m. . . . During January, rain fell in camp twice 

 on successive days, starting at 3.00 p. m. and ceasing at 8.00 p. m. 

 It was merely a light, steady rain, more the outcome of a dense 

 fog than a rain-cloud of quick approach. In Caraveli, itself, I am 

 told that it rains off and on all during the month in short, light 

 showers." This record is dated early in February and, in later 

 notes, that month and March are recorded rainless. 



Chosica (elevation 6,600 feet), one of the meteorological sta- 

 tions of the Harvard Astronomical Observatory, is still nearer the 



