INTRODUCTION. 7 



discoveries and surprises, each of which will furnish 

 another page to his mental book of Nature — an ever 

 ready and delightful volume of reference, which he 

 will often call upon memory to open when he desires 

 to conjure up a retrospect of pleasant sunny hours 

 passed within hearing of the song of the lark and 

 the soothing hum of his insect friends, in the spring 

 or summer fields. 



