THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 



261 



summarise the results, -^'hich are expressed in hourly departures from the mean of the 

 whole day, in thousandths of an inch, the heavy type indicating above the mean 

 and the italic type below the mean. (See Plate 11.) 



Cleab Weather. 



Hence the barometric curve in clear weather is of a simple character, with a single 

 maximum and minimum, except in Autumn, when there is a double period. In 

 Summer and Autumn the minimum falls much more below the average than the 

 maximum exceeds it, but in Winter and Spring there is not much difference. The 

 following are the hours of maxima and minima : — 



