158 HENRY A. HUNT. 



violence and low temperature. My informant goes on to say, 

 from his own experience, that the pampero does not get so far 

 north on the coast, although, as I have told you, in the interior 

 it does seem to penetrate. There are high ranges of mountains 

 south of Rio de Janeiro which would, I have no doubt, have the 

 effect of breaking up and deflecting any part of the pampero 

 which might get there." 



The friend's account is as follows : — " Pamperos proper occur in 

 the winter, say from the end of May till October, and generally 

 last three days. Occasionally in the summer time we have, in 

 Rio Grande, smart breezes from the south-west after rain, but 

 they do not last long, and although they come from the same 

 quarter and cool the atmosphere wonderfully, are not called 

 pamperos. While the pampero is blowing the sky is beautifully 

 clear and cloudless. Occasionally in the summer in Rio Grande 

 when the weather is very sultry, it breaks by a squall suddenly 

 setting up from the west by south-west, and though the sky was 

 clear ten minutes before, you can see the cloud roll forming in 

 the west as the cool breeze advances, and down the rain comes in 

 torrents, and in a few hours all, wind and rain, is over. Thunder 

 may or may not accompany the rain, which almost always precedes 

 (at least in Rio Grande) pamperos. I have seen pamperos as 

 strong after rain, when there was no thunder accompanying, as 

 when there was. Our thunder, too, is generally, in the summer 

 and rarely in winter. I must add that Rio Grande being further 

 north than the Plate, we do not get the pamperos with the full 

 force experienced in the Plate region. With us they are a steady 

 continuous blow for three days, varying little in force till the third 

 day, when they are felt to be gradually declining. They always 

 blow from the same quarter, the south-west, and are cold and dry." 



The most interesting fact evidenced in this description of the 

 pampero is that it always follows rain. This would seem to imply 

 that the evaporation arising from the plains is one of the immediate 

 causes of its existence. If this is the case it lends support to the 

 theory, hereinbefore submitted, that the vapour arising after rain 



