XVI INTRODUCTION. 



are apt to be a snare, especially if they are abstract ; yet 

 our language must not be babyish. Nothing is common 

 or unclean ; yet stinks are not for school. Correlation with 

 other studies is wholesome, when it is not far-fetched. 

 Finally, so far as we can, we should try to suggest that 

 Nature Study never ends. We must try to leave each 

 study as something developable like a seed in the mind. 



