iv ADVERTISEMENT. 



which forms the body of this volume, met the demand 

 with an amount of judgment, knowledge, and ability, 

 which at once fixed the character of his performance, 

 as not only an efficient and unrivalled feat of scientific 

 lexicography for the time, but also as an invaluable 

 nucleus for all sound and judicious subsequent aug- 

 mentations. In both these respects the present Editor 

 is able to testify, from his personal experience, that it 

 is still without an equal in the field of scientific litera- 

 ture ; and he can only hope that* in the Supplement 

 now appended, and the corrections which time has 

 rendered necessary in the original text, he has, with- 

 out increasing the cost of the work to the purchaser, 

 been fortunate enough to meet by a further instalment 

 the public requirement, and not wholly unsuccessful 

 in maintaining that clear and condensed style of 

 explanation, of which Mr. Buchanan has given so 

 excellent an example, and without which the present 

 enlargement would not have been possible within due 

 limits. 



London, 1876. 



