94 NATURE STUDY 



glass exposed to the breath, or to the surface of the skin, or the 

 under surface of a leaf, or over the flame of a lamp or candle, will 

 show that there is vapor of water coming from all these sources. 



Water may be distilled from a flask, by connecting it by a 

 tube to another vessel. The water boiled in the flask will pass as 

 steam into the tube, which is kept cool by moistening it. From 

 the tube the water drops into a receiving vessel. 



It may be said, in passing, that it is now taught that in the 

 formation of fog and clouds, each particle of water of the fog or 

 cloud has condensed upon a particle of dust in the air, and if 

 there were no particles of dust there could be no fog, clouds or 

 rain. By "dust" is meant any small object floating in the air, 

 such as go to make up what we commonly speak of as dust and 

 smoke. 



The application and illustration of the above lessons will occur 

 to each one. 



