156 HENRY A. HUNT. 



a difference of 17 '2° ; two minutes later there was a fall to 79*7° 

 or a further difference of 0*6°. The thermometer remained at 

 this reading until after two o'clock, but at 2*15 it descended to 

 75°, being a drop of 4*7° more and a total drop of 22*5° in twenty- 

 five minutes. The diurnal range in this instance was 23-8°. 



VELOCITY OP WIND IN THE BURSTER. 



It occasionally, though rarely, happens that the greatest velocity 

 of a burster is reached at the change or during the first hour 

 thereafter. In most cases, however, the maximum force is attained 

 about twelve hours afterwards. As the majority of bursters occur 

 between the hours of seven and twelve p.m. (see Table I.), it there- 

 fore follows that the wind is usually strongest between seven and 

 twelve a.m. on the following day. 



UNSEASONABLE WINDS. 



In those instances where the greatest velocity was reached im- 

 mediately on the arrival of the burster, the winds preceding were 

 generally of an unseasonable character — that is to say north- 

 westerly in the summer and north-easterly in the spring and 

 autumn months. Under these circumstances the burster, though 

 strong, was generally of brief duration. 



THE PAMPERO. 



The opinion has long been held that there is a close analogy 

 between the sutherly burster of Australia and the pampero of 

 South America. The writer therefore sent a detailed description 

 of the burster to a friend formerly resident in Brazil, and requested 

 him to note the points of similarity between it and the pampero. 

 The following is a copy of his reply which is based, as will be seen, 

 partly on personal observation and partly on information gathered 

 by him from sources on which he places reliance : — 



"In answer to your letter of 14th of April, I am afraid I can 

 afford you very little information on the subject of the South 

 American pamperos from personal observation. They never 

 reached, on the coast, as far north as Rio de Janeiro which was 

 my usual place of residence, but I twice experienced their violence 

 when on my exploring expedition across Brazil in 1872-3. The 



