Frequently the water was impregnated with limestone solution, which became solidified as each drop left a deposit at the point of departure. This formed rough stalactites, which might be called stone icicles, because their formation was similar to the formation of an icicle of the water dropping from the roof. So likewise on the floor of the cave where the limestone solution dropped was built up from the bottom a covering of limestone with inverted stone icicles called stalagmites. Underneath the latter were found layer after layer of relics from the habitation of man, encased in stone to be preserved forever or until broken into by some outside pressure. Of course, comparatively few of all the relics around these habitations were preserved, because those outside of the stone encasement perished, as did undoubtedly large masses of remains around the mouth of the cave. In these caves of Europe are found the bones of man, flint implements, ornaments of bone with carvings, and the necklaces of animals' teeth, along with the bones of extinct animals. In general the evidence shows the habits of the life of man and also the kind of animals with which he associated whose period of life was determined by other evidence. Besides this general evidence, there was a special determination of the progress of man, because the relics were in layers extending over a long period of years, giving evidence that from time to time implements of higher order were used, either showing progress or that different races may have occupied the cave at different times and left evidences of their industrial, economic, and social life. In some of the caves skulls have been discovered showing a brain case of an average capacity, along with others of inferior size. Probably the greater part of this cave life was in the upper part of the Paleolithic Stone Age. In some of these caves at the time of the Magdalenian {73} culture, which was a branch of the Cro-Magnon culture, there are to be found drawings and paintings of the horse, the cave bear, the mammoth, the bison, and many other animals, showing strong beginnings of representative art. Also, in these caves were found bones and stone implements of a more highly finished product than those of the earlier primitive types of Europe.