Everybody is familiar with the habits and wonderful industry of hive-bees, wasps, and ants. These insects seem to be governed by something more than blind instinct: it is hardly too much to say that they give indubitable signs of intelligence. They know how to modify their course according to circumstances, to provide against unexpected wants, to avert dangers, and to notify to each other whatever is of consequence to be known by their whole community. Huber, the celebrated bee-keeper of Geneva, relates the following anecdote: One of his hives having been devastated one night by a large sphinx-moth, the bees set to work the next morning and plastered up the door, leaving only a small opening which would just admit them, one at a time, but which the sphinx, with its big body and long wings, could not pass. As soon as the season arrived when the moths terminate their short lives, the bees, no longer fearing an invasion, pulled down their rampart. The next season, as no sphinx appeared to trouble them, they left their door wide open. _Ostrich-keeping_.--By late news from the Cape of Good Hope we learn that the farmers of that colony are beginning to find it profitable to keep flocks of ostriches, for the feathers of those birds are worth £25 sterling the pound. For thirty-five ostriches, there must be three hundred acres of grazing-ground. The plucking takes place once in six months; the yield of feathers from each bird being worth from £10 to £12, 10s. The original cost of the young ostriches is said to be £5 each. Some of the {136} farmers who have tried the experiment are of opinion that ostrich-feathers will pay better than any other produce of the colony. _Extraordinary Inland Navigation_.--We hear from South America that a steamer built in England for the Peruvian government, for the exploration of rivers, has penetrated the great continent from the Atlantic side to a distance of ninety-five leagues only from the Pacific, or nearly all across. The vessel, which draws seven feet water, steamed seven hundred leagues up the Amazon, two hundred up the Ucayati, and thence into the Pachitea, which had never before been navigated except by native canoes. What a magnificent extent of inland navigation is here opened to commercial enterprise! The mind becomes somewhat bewildered in imagining the future of those vast river-valleys when hundreds of steamers shall navigate the streams, trading among millions of population dwelling on their banks.