viii PREFACE, 
of many years in a concise and intelligible form. He 
should perhaps add, in conclusion, that in the rare instances 
in which recent events show his facts or suggestions in a 
new or altered light, it has been thought better not to 
attempt to remodel that which has been already written, 
but to draw attention to any apparent discrepancies by 
the use of footnotes. 
Woonvates, February, 1880, 
