MR MOSSMAN ON SILVER THAW. 527 



followed or preceded by storms on our northern and north-western coasts. It has 

 been shown that silver thaw is not, as a rule, associated with strong winds on Ben Nevis. 

 It therefore would appear that the barometric gradient at the level of Ben Nevis (4407 

 feet) must differ from that at sea-level under these circumstances. In many cases 

 the gale set in simultaneously with the beginning of the silver thaw on Ben Nevis. 

 It was also evident, from the daily weather charts, that when silver thaw occurred on 

 Ben Nevis while an anti-cyclone lay over England, the weather in the British Isles got 

 steadily worse in the immediate future. 



