Geology and Mineralogy. 65 
the Voleanic. Even these subdivisions are enough to make a 
chart of the kind valuable to the general reader. 
It is a little puzzling to us to explain why such a chart should 
have been compiled for “the 9th Census.” There is nothing in or 
distribution of mineral products of economical importance. The 
9th Census Reports claim to represent the known condition of the 
country in the year 1870, and this they do with great fullness 
both in the text and the various excellent maps issued by Gen- 
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veys, and be issued in the best possible style. It would be a great 
thing for the nation’s industry as well as its science if the work 
could be soon begun, and the best of American art and science 
be engaged upon it. 
The lithographer has done his part on the 9th Census map badly. 
The glaring colors are selected without taste, and are so unskill- 
fully put on that those of adjoining areas often overlap some miles, 
and sometimes to the obliteration of a narrow intermediate area 
that was in the original copy. As one exam le, the Connec- 
ticut River Red Sandstone formation, besides being narrowed 
ning. 
Such careless work does not appear on the Canada geological 
chart, or those published abroad. j : 
ere are a number of improvements—improvements In our view 
