CONTENTS. 



CHAPTER I. 



PACK 



ON MICROSCOPES IN GENERAL . . 1 



CHAPTER IT. 

 THE MICROSCOPE UNPACKED 10 



CHAPTER, III. 

 COLLECTION AND MOUNTING OF OBJECTS ... .20 



CHAPTER IV. 

 STRUCTURE or INSECTS' WINGS 30 



CHAPTER V. 

 SCALES OF INSECTS AND FISII 37 



CHAPTER VI. 

 HAIRS AND FEATHERS . * . 52 



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