Not one of these outlines is unmistakable, and all lack the characteristic tusks of the mammoth. [Illustration: FIG. 2.--Elephant Pipe (Louisa Co., Iowa).] [Illustration: FIG. 3.--Elephant Pipe (Louisa Co., Iowa).] Figures 2 and 3, the now famous "elephant pipes," the authenticity of which is doubted, however, in the last report of the Bureau of Ethnology, came to light in Louisa County, Iowa. The former, discovered in 1872 or 1873, was found, it is said, on the surface by a farmer while planting corn; and the latter, more interesting from the scratches upon it evidently intended to represent hair, was taken from a mound near an old bed of the Mississippi by the Rev. Dr. Blumer and others on March 2, 1880. The material of the two pipes, which apparently have been much greased and smoked, is the same--a light-colored sandstone. The next of the elephant _documents_ is the so-called elephant mound of Grant County, Wisconsin, (fig. 4). It was described by Mr. Jared Warner, of Patch Grove, Wisconsin, on page 416 of the "Smithsonian Report for 1872," when public attention was first generally called to it. The effigy, 135 feet long, 60 feet broad, and but 5 feet high, is situated on the east bank of the Mississippi, just below the mouth of the Wisconsin, and, says Mr. Warner, has been known in the neighborhood of Patch Grove for twenty-five years as the "elephant mound." Like the elephant pipes, however, it lacks the characteristic tusks, and sceptics claim that its original shape has been too much modified by many years of cultivation to render judgments concerning it admissible. [Illustration: FIG. 4.--Elephant Mound (Grant County, Wisconsin).] But to return to the carving, a somewhat novel feature in it, and one which has been objected to as casting a doubt upon its authenticity, is the spear between the two upright human figures on the right. Large flint spear-points, so-called, are found abundantly in the Eastern States, and within the last hundred years instances of the use of the spear by the Indians in hunting and fishing are common; no one doubts, as we learn, for instance, in Tanner's narrative, that the Indians speared salmon in the Eastern rivers, or, as Catlin shows, used steel-pointed lances in their Western buffalo hunts. Yet the early writers, in their descriptions of aboriginal implements, have been supposed to make no mention of the spear, and there has been some controversy among archæologists as to whether it can be classed among Indian prehistoric weapons of warfare or the chase.