holes the earth, which has been thrown far out, forms smooth hillocks. There were many well-defined and well-trodden paths on the ground, by which the Voles pass from one hole to another. They are never seen out of their holes by day, not even in places where the entire ground is riddled with holes like a sieve. They do not come out in search of food till the evening; even then not many are to be seen, but the peculiar squeaking noise they make is to be heard everywhere. Next day all sorts of freshly-severed plants are to be found in the holes. Stalks of corn they manipulate by standing on their hind legs and gnawing through the stalk; when this is bitten off they drag it into their holes to devour it there, sometimes making it smaller. They do their work with amazing rapidity. One evening a field was visited which was to be mowed next day, but when the labourers came in the morning they found nothing to cut. The Voles had destroyed the entire crop in a single night. A miller in the neighbourhood of Velestino reported that he went to his field early one morning, cut a measure of corn, loaded it on his ass, and brought it to his mill. When he returned to his mill with a second load he found scarcely a vestige of the first remaining. Thinking it had been stolen he kept watch for the thief; but suddenly, to his great astonishment, hosts of Voles appeared and set to work to carry off the second load." Such facts as these recorded by Loeffler are by no means a merely recent phenomenon; Aristotle was familiar with the devastations of the Voles, and wrote that "some small farmers, having one day observed that their corn was ready for harvest, when they went the following day to cut their corn, found it all eaten." Other ancient writers record similar facts.[50] [49] _Centralblatt f. Bak. u. Parasitenkunde_, July 1892, and _Zoologist_, September 1892. [50] _Zoologist_, May 1893. It may be added that the Scottish Vole, which was so destructive about the same time, does not burrow to a depth like the Thessaly Vole, but lives in shallow runs amongst the roots of herbage. Its exploits are recorded in a Report on the Plague of Field-Mice in Scotland, made by a committee appointed by the President of the Board of Agriculture, 1893. Two birds of North America, belonging to the Woodpecker family, prepare their provisions for the bad season with consummate art; not only do they harvest them and place them in shelter, but they arrange them in such a manner that at the right moment they can utilise them in the most convenient manner.