PREFACE. 



as in other branches of Natural Science, our country 

 should take the leavi in work wliich is for the in- 

 formation and advantage of the >Yhole civilized 

 world, and could only have been accomplished by 

 the hard and patient labour of many years. 



P. L. S. 

 H. S. 



3 Hanover Square, 

 October 1 St, 1898. 



