VI PREFACE. 



that they will be found useful both to the student and to the 

 lovers of natural beauty. My thanks are due to Drs. Griffith, 

 Smyth, Plomley, and other gentlemen for their kindness 

 during the progress of the work. 



JOHN H. MARTIN. 



Week Street, Maidstone, 

 December 1870. 



