CONTENTS, 



CHAPTER I. 



PAGE 

 A HALF-HOUR ON THE STRUCTURE OF THE MICROSCOPE . . 1 



CHAPTER II. 



A HALF-HOUR WITH THE MICROSCOPE IN THE GARDEN.. 16 



CHAPTER III. 



A HALF-HOUR WITH THE MICROSCOPE IN THE COUNTRY . . 31 



CHAPTER IV. 



A HALF-HOUR WITH THE MICROSCOPE IN FRESH WATER. . B9 



CHAPTER V. 



A HALF-HOUR WITH THE MICROSCOPE AT THE SEA-SIDE. . 49 



CHAPTER VI. 



A HALF-HOUR WITH THE MICROSCOPE IN-DOORS 59 



