On the shores of the lakes which furnished them with a place of habitation they raised many of our present species of grain. Owing to a cause of which we have already spoken—that is, destruction of the lake settlements by fire—the carbonized remains of these cereals have been preserved to us. There were four varieties of wheat raised, none exactly like our common wheat. In addition to this they raised barley and millet, several varieties of each. Nor were the fruits neglected. Apples and pears were dried and laid away for use in the Winter. Seeds of the common berries were found in abundance, showing that these primitive people were fully alive to their value. From this it follows that the Neolithic people were not only tillers of the soil, but horticulturists as well. According to Dr. Keller, the vegetable kingdom furnished their principal supply of food. Hazelnuts, beechnuts, and chestnuts were found in such quantities as to show they had been gathered for use. Neither hemp, oats, nor rye were known. Not only do we find the remains of the grains, fruits, seeds, etc., from which the above conclusions are drawn, but, farther than this, pieces of bread have been found in a carbonized state, and thus as effectually preserved as the bread of a far later date found in the ovens of Pompeii. According to Figuier, the peasant classes of Tuscany now bake bread, after merely bruising the grain, by pouring the batter on glowing stones and then covering it with ashes. As this ancient prehistoric bread is of similar shape, it was probably baked in an equally primitive fashion.21 Aside from the natural interest we feel in these evidences as to ancient industry, a study of the remains of plants cultivated by the Neolithic people reveals to us two curious and suggestive facts. It has been found that the wild plants then growing in Switzerland are in all respects like the wild plants now growing there. But the cultivated plants—wheat, millet, etc.—differ from all existing varieties, and invariably have smaller seeds or fruits.22 This shows us that man has evidently been able to effect considerable change by cultivation, in the common grains, during the course of the many centuries which separate the Neolithic times from our own age. But if this rate of change be adopted as a measure of time, what shall we say is to the antiquity demanded to explain the origin of cultivated grain from the wild grasses of their first form?