NATURE & OBSERVATION 



the ground, and we find poor shabby plants 

 that seem to have a hard struggle for existence, 

 or else such things as ivy and a few other forms 

 of vegetable life that have learnt how to live 

 without much sunshine. All the plants that 

 men or animals use for food require light and 

 warmth, and we ourselves also become stronger 

 and healthier in sunlit rooms. Grass grows in 

 the open fields and in the shaded woods ; let 

 us look carefully and see if it seems to be the 

 same in both places ; and notice which sort the 

 cattle and sheep prefer, if they have the choice. 

 There is all the difference in the world between 

 the north side of a wall and the south side, as 

 any gardener will tell us ; and a great deal of 

 difference between the north slope of a hill and 

 the south slope, although the sun may shine 

 even on the north side for many hours of the 

 day. We already know a good deal about any 

 piece of ground if we know whether it faces 

 east or west, north or south. 



(7) 



