Taking a hint from little brooks and the surrounding fields, let us consider, in conclusion, the more pretentious rivers and their surrounding uplands. Will the same results be obtained? Can we venture to reach out from the particular to the general? These were the questions that I frequently asked myself, and, after many a weary tramp and toilsome digging over a wide area, I am happy to state that I believe my efforts have been crowned with a full measure of success. What held good in a particular field holds good of a county, and what I now claim for the tide-water portion of the valley of the Delaware I believe is true of a much more extended area. In no case have I been able to find stone implements significantly distributed over a considerable space—i. e., tracts of five hundred to a thousand acres—except where there was, or very recently had been, running water. The ground then to be examined was either the high land that shut in the valley, or the valley itself, limiting that term to the banks of the stream and the immediately adjacent meadow tracts; exception being made where the bank of the stream was and always had been very precipitous. In such a case the brow of the bluff would be equivalent to the meadow or low land of a gently sloping valley. In every such instance—and I have made or have had made many careful examinations of river and creek valleys—the result was the same: a very marked preponderance of argillite implements on the crests of the uplands, and a very great excess of jasper and quartz on the bottom-land, or that directly adjacent to the stream. From this condition I am led to infer that, when these higher points were occupied, the present streams maintained a uniform flow as high as the freshet stage of these water-courses; and the fact that an Indian village site near by will be much nearer the river or creek shows clearly, I hold, that on a small scale the same conditions were repeated that occurred in the gradual change from glacial to post-glacial times. The volume of water in all our streams, comparing century with century, is gradually lessening. Comparing then the rude objects of argillite, specialized as they are, with the magnificent flint-work of the historic Indians, I would designate the former as _fossil implements_, the latter as _relics_.