208 RADIATION. 



Q. WHAT kind of things RADIATE HEAT most 



FREELY ? 



A. Grass, wood, and the leaves of 

 plants, radiate heat very freely: but 

 polished metal, smooth stones, and 

 woollen cloth, part with their heat very 

 tardily. 



Q. Do the leaves of ALL plants radiate heat 



EQUALLY WELL ? 



A. No. Rough woolly leaves (like 

 those of a holly-hock) radiate heat much 

 more freely, than the hard smooth polished 

 leaves of a common laurel. 



Q. Shew the WISDOM of GOD in making grass, 

 the leaves of trees, and ALL VEGETABLES, EXCEL- 

 LENT RADIATORS of heat. 



A. As vegetables require much mois- 

 ture, and would often perish without a 

 plentiful deposit of dew, God wisely made 

 them to radiate heatjreely, so as to chill 

 the vapour (which touches them) into 

 dew. 



Q. Will polished METAL, smooth STONES, and 

 woollen CLOTH, readily collect DEW ? 



A. No. While grass and the leaves 

 of plants are completely drenched with 



