220 RADIATION. 



Q. Zs the AIR made COLD in a similar way ? 



A. Yes. The air resting on the 

 earth is made cold by contact : this cold 

 air makes the air above it cold ; and cold 

 currents or winds shake the whole together, 

 till all becomes of one temperature. 



Q. Why is MEAT very subject to TAINT on a 

 MOON-LIGHT night? 



A. In a bright moon-light night, 

 meat "radiates heat very freely; and is, 

 therefore, soon covered with dew, which 

 produces rapid decomposition. 



Q,. Why do PLANTS GROW RAPIDLY in MOON- 

 LIGHT nights ? 



A. In bright moon-light nights rapid 

 radiation is carried on, and dew is 

 plentifully deposited on young plants, 

 which conduces much to their growth 

 and vigour. 



Q. Why is evening DEW INJURIOUS to 



HEALTH? 



A. Because the condensed vapours 

 are always laden with noxious exhalations 

 from the earth : this is especially the case 

 in marshy countries. 



Q. Is HONEY-DEW a similar thing to DEW ? 



