326 SUGGESTIONS FOB WEATHER STUDY. 



anti-cyclone in summer " the weather is brilliant, hot, 

 calm, with haze at night or heavy deposits of dew, on 

 account of great cooling by radiation." In winter " an 

 anti-cyclone is calm and clear, and by intense radiation the 

 land cools down greatly at night and the temperature of 

 the air falls. This is the condition required for long spells 

 of frost, and in large towns and over lakes and estuaries it 

 produces dense, low-lying fogs." 



With regard to weather studies to be made in connection 

 with times of leafing, etc., of trees, habits of animals, agri- 

 cultural operations, etc. (phenology), see pp. 10, 41. 



