PRELIMINARY 7 



is to prepare the way for more detailed and difficult observa- 

 tions, aim in these preliminary observations to arouse the interest, 

 try to get what the French call a tremplin, a point from which 

 a further flight may be made. For this purpose it is especially 

 important to emphasise the effect of the periodic changes of 

 weather upon plants and animals, and upon ourselves. The 

 spontaneous observation " it is nice when the sun shines " is 

 really a scientific statement of the highest value, and should be 

 encouraged as such. 



