ACKNOWLEDGMENTS. 
Tue author is indebted to Prof. EK. HaAwortH, under whose 
direction this work was undertaken, for constant advice and 
encouragement throughout its prosecution. Thanks are also 
due Prof. A. J. Mosas, of Columbia University, New York, for 
helpful assistance. ‘To the other members of the Survey, 
Doctor CRANE, Messrs. McCiair, McFaruanp, and Starrorp, 
I would express my appreciation for services rendered. To 
the following-named gentlemen I wish to acknowledge my 
indebtedness for help and suggestions of various kinds: Dr. 
H. Fostrr Bain, of the United States Geological Survey ; Prof. 
W. O. Crossy, of the Massachusetts Institute of Technology ; 
Mr. F. H. Bringceruorr, of Aurora, Mo.; Mr. W.G. Kang, of 
Kansas City; Mr. James Roacu, of Joplin; and Col. J. V. 
PimRcE, of Galena. And, finally, much credit is due many 
mine-owners and workers throughout the district, without 
whose aid the work would have been much more difficult and 
less satisfactory. 
INTRODUCTION. 
THE lead and zinc district of southeastern Kansas and 
southwestern Missouri constitutes a distinct mineralogical 
province, so that any discussion of its minerals should include 
the district asa whole. It is for this reason that in this work, 
a Kansas report, the state line is disregarded. 
The minerals of the region have as yet received no adequate 
description. Only two minerals have been given much sci- 
entific attention, calcite and leadhillite, for both of which 
minerals the district is justly famous. These, together with 
incomplete lists of the minerals and some isolated analyses, 
constitute the literature. The present work deals principally 
with crystallography, for that has been most neglected. 
The drawings were made by the writer, some of them be- 
ing copied from other works. Some of the drawings, par- 
ticularly those of calcite, are in whole or in part free-hand 
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