LAKES AND RIVERS, 



INTRODUCTION. 



THE fresh-water system of Great Britain affords the 

 naturalist a field for observation too extensive to 

 be exhausted within the limits of a small book. 

 Hence the necessity of making some selection, so as 

 to show what is most characteristic, to awaken observa- 

 tion, and entice on to the perusal of more compendious 

 monographs, which those who pursue a speciality 

 among any of the departments of fresh-water life will 

 require. Among the books best known to the author, 

 where further information can be found, are, Bell's 

 " British Quadrupeds," Macgillivray's "British Quadru- 

 peds/ 7 YairelPs "British Birds," Macgillivray's "British 

 Birds," Bell's " British Reptiles," Hewitson's "Eggs of 

 British Birds," Couch's, Yarrell's, and Buckland's works 

 on British Fishes, and Curtis's illustrations of British 

 Entomology. I do not, however, know of any really 



