Vili TRANSLATOR’S PREFACE. 
directions intimated, and to secure for the same a still wider 
recognition and better appreciation of its usefulness. 
In the preparation of this edition, the translator has been 
kindly favored by Professor Fliickiger with a few additional 
notes, which have been suggested by the advances in literature 
or in the related sciences during the short period which has 
elapsed since the publication of the German edition, and a list 
of the illustrations occurring in the work has also been ap- 
pended. 
The translator may finally be permitted to state that he has 
endeavored to preserve in this edition not only the form, but 
also the attractiveness of the original work, and while attempt- 
ing to follow the original as closely as was consistent or possi- 
ble, has spared no pains to maintain accuracy of diction and 
the correct rendition of many newly adopted technical terms. 
That the work may accomplish the mission designed by its 
authors, receive to some degree the appreciation which it 
merits, and be made available to a larger circle of readers, was 
the highest purpose and the chief desire attending the labor 
which the translator has been permitted to bestow. 
UNIVERSITY OF Wisconsin, MADISON, January, 1887. 
