众 BULLETIN OF THE UNIVERSITY OF WISCONSIN ECONOMICS AND POLITICAL SCIENCE SERIES VOLUME VI 1910 PUBLISHED BY AUTHORITY OF LAW AND WITH THE APPROVAL OF THE REGENTS OF THE UNIVERSITY MADISON, WISCONSIN 1910 BULLETIN OF THE UNIVERSITY OF WISCONSIN COMMITTEE OF PUBLICATION WALTER M. SMITH, Chairman O. CLARKE GILLETT, Editor THOMAS S. ADAMS, Economics and Political Science Series WILLIAM H. LIGHTY, University Extension Series WILLIAM S. MARSHALL, Science Series DANIEL W. MEAD, Engineering Series JULIUS E. OLSON, General Series EDWARD T. OWEN, Philology and Literature Series |