THE WONDERS OF VEGETATION. 35 



in the tropics neither wheat nor any other cereal will 

 thrive ; but are these countries on that account unin- 

 habitable ? By no means. When wheat no longer 

 ripens, other vegetables take its place ; trees furnish 

 our daily bread and wine in their fruit ; milk flows 

 in the shape of creamy, sap and the fruits of northern 

 countries are replaced by those of another climate. 

 Let us select the characteristic types of these valuable 

 plants, and if we cannot see them in their own coun- 

 try let us at least call them up before our mind's eye 

 and make them tell us their own history. 



