This material is a portion of the outcome of Dr. Lane's studies in connection with the geological survey of the State of Michigan, supplemented by statements received in reply to circulars sent throughout the Lower Peninsula of Michigan to well drillers and others likely to be well informed and interested in the subject. The facts thus gathered have been collated with the result of two months' field work during the autumn of 1897. The complete report has assumed such bulk that it has been found necessary to divide it into several parts. The first of these, containing the general conclusions, is herewith presented. The remaining data fall naturally into two classes, the first consisting of analyses of waters and the second of detailed descriptions of the supply at various localities visited.