Woodbridge and Willard’s Geography. 397 
washed bare on the banks of the Ohio and Green rivers—- 
intermixed is a mineral of a bright green and yellow hue, 
which is used for the same purposes as Copperas, Families 
that die woollen or cotton cloth collect a quantity of this 
coal, putit into a proper vessel to which they add water and 
boil till the water has extracted the mineral from the coal. 
In this water they immerse the articles to be dyed. Cop- 
peras too has been manufactured from this coal, in some 
smal] quantities, and sent abroad for market. 
Through this coal all the waters in and about Henderson 
probably pass, and thereby acquire strong mineral proper- 
ties, which give them a particular taste and render them 
pernicious to health.” i i 
6. 4 System of Universal Geography, on the principles 
of Comparison and Classification; illustrated by Maps and 
Engravings. Modern Geography. by William C. Wood- 
bridge, A. M. late Instructor in the American Asylum. 
Ancient Geography, by Emma Willard, Principal of the 
Female Seminary at Troy. Hartford: published by Oli- 
ver D. Cooke & Sons. 1824. 
The principal object of the authors, in preparing this 
work, was to give to Geography that scientific arrangement 
which has been so successfully applied to other branches of 
study. Most works on this subject have presented little 
more than a collection of facts, grouped by an imper- 
fect method, and so little connected by any associating 
principle, as to overload the memory and fatigue the mind. 
Little or no use has hitherto been made, by the greater 
number of writers, of the important principles of classifica- 
tion, in reducing geography to the form of a science, and 
thus increasing the facility of acquiring and retaining its de- 
tails. Mr. Woodbridge divides the subject into Physical, 
Political and Statistical Geography. Under the first head 
are given general views of the structure and natural divis- 
ions of the earth—its rivers, mountains, climates, produc- 
tions, &c. Political Geography isa description of the state 
of men in society, including an account of their govern- 
ment, religion, knowledge and arts. Statistical Geography 
is a description of states and empires, with their extent, 
population and resources. ‘The manner in which these 
subjects are treated shows extensive research, and under 
