202 REVIEWS 
still room for more in the first part even though it should be at the 
expense of some of the excellent half-tones in the second part. 
Part II treats of the ore deposits in detail, taking up the metals 
one by one, beginning with the more common useful metals, as iron, 
copper, lead and zinc, followed by the precious metals, silver and gold, 
and closing with the lesser metals. ‘The most important of these, iron 
and gold, are treated more fully than the others and it is here we find 
the greatest changes in the new edition. This portion consists largely 
of a well arranged and classified review of the best literature on each 
locality, all the more valuable to the investigator because specific ref- 
erences to the original sources of information are given, thus making 
it a handbook and manual of reference. Field studies and personal 
observations in many of the leading mining centers have enabled the 
author not only to present the most salient features, but to supplement 
this from his own notes. 
The features of the new edition that show the most marked changes 
are as follows: (1) The Lake Superior iron district is completely revised 
to accord with the enormous developments which have taken place; 
(2) the part on limonite ores has been expanded; (3) the Butte 
district has a new description and maps based on the excellent folio of 
the United States Geological Survey; (4) the same is true of the 
Cripple Creek and other districts in Colorado; (5) the part on the 
gold deposits of the southeastern states has been rewritten and enlarged ; 
(6) a description of the Canadian mining districts, which did not 
appear in former editions, has been added. 
Wo, Isle 
The Fauna of the Chonopectus Sandstone at Burlington, lowa. By 
Smee Wiican,  IWiceins, Sie, ows Avcacl, Scrence, Woll, 2X, 
No. 3, pp. 57-129. Plates I-IX. Feb. 1900. 
In his series of Kinderhook faunal studies, of which the present 
paper is the second,’ Mr. Weller is doing a much-needed work of 
revision. The rocks now classed as Kinderhook mark the border line 
between the Devonian and the Carboniferous over an important por- 
tion of ‘the Mississippi valley. They were, by the earlier workers, 
referred at times to both periods, and there was much dispute as to 
their proper classification and correlation. Finally Meek and Worthen 
1 For first see Trans. St. Louis Acad. Sci., I, No. 2., pp. 9-51. 
