CONDENSED VAPOUR. 217 



A. The wooden banister, (being 

 made of some very close-grained, var- 

 nished wood) cannot change its tempera- 

 ture so fast as the air ; and, therefore, 

 remains cold some time after the thaw 

 has set in. 



Q. How does THIS account for the 

 BANISTERS being DAMP ? 



A. The vapour of the warm air 

 (coming in contact with the cold banisterj 

 is chilled, and L condensed into water 

 upon it. 



Q. Why is our BBEATH VISIBLE in WINTER 

 and NOT in SUMMER ? 



A. In winter the coldness of the air 

 condenses our breath into visible vapour ; 

 but in summer the air is not cold enough 

 to condense it into visible vapour. 



Q. Why are our HAIR and the BRIM of our 

 HAT often covered with little drops of pearly DEW 

 in winter-time ? 



A. The breath (issuing from our 

 mouth and nose) is condensed into 

 drops, as it comes in contact with our 

 cold hair or hat; and (being condensed) 

 hangs there in little dew-drops. 



