Although resembling the chipped points or knives in their general form, certain smooth objects are found which he observes are quite different in material from the average; being ground and not chipped. Professor Perkins states: “These represent a class of implements which are found on both sides of Lake Champlain. They are all made from slate, red, purple, or drab, such as occurs abundantly in this region. The use of these objects is rather problematical. They are almost always well made, the surface is smooth and almost polished, the edges are sharp and do not indicate that the tool had been severely treated. And yet the material is not very hard and is very brittle, and some of the specimens (knives?) are slender. One is nine inches long and an inch and a half at the widest part; it would easily break, and there are other specimens nearly as fragile.... The greater number are three or four inches long and of varying width. All are stemmed, and usually the stem is notched on each side. In the collection at Burlington there are more than thirty of these objects, and a smaller number in the state collection at Montpelier.” Leaving New York, passing south into the great Chesapeake region, the slate points of New England and the jasper of New Jersey have disappeared. Instead we have chert, quartzite, argillite, rhyolite, calcareous quartzite, and the peculiar modeled white and pink quartzite. Specimens from this region are illustrated in Figs. 40, 86, and 92. It is quite easy to recognize them, as reference to the plates will prove. [Illustration: FIG. 214. (S. 1–1.) Drill. Spears. Dr. H. M. Whelpley’s collection. Presented as beautiful examples of American art in flint. ] The number of flint implements in the State of Pennsylvania is surprising. The range is greater than that found in any other section of the country. Pennsylvania types are shown in Figs. 82, 83, 94, and 114. Professor E. H. Williams, Jr., has called my attention to the broad distribution of quartzite and argillite and to the fact that many shades in color and variation of texture are to be observed in these two materials. I regret that it is not possible to present a series of colored plates illustrating the various color shades of the same material. By that means I would emphasize what I wish to convey to readers of “The Stone Age.”