PREFACE. JX 



be read with candour ; and that the defects I 

 have been guilty of upon this difficult subject 

 may be not so much reprehended as kindly 

 supplied, and investigated by new endeavours 

 of my readers.' 



WM. LEIGHTON JOKDAN. 



GERRARD'S CROSS, BUCKS : 

 December 17, 1866. 



