viil PREFACE. 



In conclusion I have only to express my hope 

 that my work, however imperfect, may at least 

 be useful ; and should it in any Avay advance our 

 favourite study, or he of assistance to any of my 

 fellow- students, I shall feel that the labour I 

 have expended upon it has been well rewarded. 



H. E. COX. 



London, November, 1874. 



