PKEFACE. 



The following Appendix is an abridgement of the larger 

 work published in 1892 as Part V. of Professor Foster's 

 Text-book. The reduction in bulk has been effected by the 

 omission of the discussional parts in the original, as also of 

 many less essential details as to methods, etc., and of the 

 references to the literature of the subject. 



A. SHERIDAN LEA. 

 July, 1896. 



