Dr. Munro’s work was published in 1900, and its principal object was to induce the South African Government to adopt the system of dealing with the locust plague which had been practised with such entire success in the isle of Cyprus. Whether this has since been done, and with what results, I am unable to say. In Cyprus, however, the locusts, which from the year 1600, especially, have changed the country from a garden into a wilderness, were in one season almost entirely swept away. The method by which so great a result was effected is the invention of an Italian gentleman—Signor Matthei by name—resident in the island, and is based upon the inability of the immature locusts, the footgangers—probably the grown ones too, but this is immaterial—to crawl up a smooth perpendicular, still more an overhanging surface. Such a surface was supplied by a long band of leather, glazed and polished, surmounting a strip of calico, which was made about four feet high, but need not, as it was afterwards found, have been more than two. This insurmountable obstacle, supported at intervals by sticks set in the ground—not upright, but slanting a little towards the path of the locusts—was set up over a large area of country like a miniature Chinese Wall, and proved even more insurmountable. At intervals along the inner side of the barrier deep pits were dug, whilst at wider ones stood men provided with brooms, spades, brushwood, and all else requisite. When the locusts arrived at the Chinese Wall they climbed up the canvas part of it, but being unable to pass the smooth band of leather they fell down in heaps, and their ever-increasing multitudes soon filled the pits, in which they were buried, burnt, stamped down, or otherwise provided for. Afterwards their carcases were dug out and heaped on carts, and the pits, being empty again, were ready for more. In this way two hundred million quadrillion billions—or something of that sort—of locusts were destroyed, and next year when everything was again ready for them hardly any appeared. By this invention, as simple as it is ingenious and inexpensive, the locust plague in Cyprus has become a thing of the past, and if the conferrer of so great a benefit was ever not a man of large fortune, let us hope that that has become a thing of the past, too, for he must have saved several to the British Government. If the locusts, after coming to the Chinese Wall and finding themselves unable to climb it, had turned round and walked in another direction, this would have made a capital instance of intelligence shown by insects—but they did not do so.