The principle on which artesian wells act is very simple and can be understood by any schoolboy. Though this principle is very simple, there are so many varying conditions that many expensive failures result. Millions of dollars have been spent to get pure wells of flowing water, with nothing to show but holes in the ground or a flow of useless mineral water, but sometimes a good quality of mineral water is obtained. At Henry, Illinois, a flowing well of sulphur water is highly valued by the people, who come many miles to obtain it, while a few miles north of Henry, at Bureau Junction, there is a well of soda water which is very palatable. Some of the best authorities say that only flowing wells should be called artesian. I will refer to a few of the many flowing wells. The hot springs in many parts of the world are natural artesian wells, the water being forced up from great depths. It is estimated that there are more than fifty thousand wells east of the Mississippi River from one to two thousand feet in depth, drilled to obtain petroleum oil or the inflammable gas which accompanies it. These are as strictly artesian wells as those that send up water. Among the most noted artesian wells is the one at Grenelle, in Paris. In boring this well, after going down one thousand seven hundred and ninety-seven feet and passing through a stratum of rock over a subterranean fountain, the drill suddenly fell fourteen feet and the water soon rose above the surface. The temperature of the water coming from this well is eighty-two degrees, Fahrenheit. It is conducted by pipes to the hospital in the town, for heating purposes. The bore in most artesian wells is from three to six inches in diameter, but the one at Passy, near Paris, is twenty-eight inches in diameter and one thousand nine hundred and twenty-five feet deep. In town and country a pure water supply is of the utmost importance to the health of the people and in many countries it can only be obtained by deep and expensive boring. Various uses are made of water flowing from artesian wells. In many places it is used to propel machinery. In the desert of Sahara artesian wells have become of great value in making the country near them habitable, as the flow is sufficient to irrigate large areas of land. Two new villages have been built in the desert and two hundred thousand palm trees have been planted about these wells. In the Western part of the United States, where the rainfall is limited, many artesian wells have been bored, the water being largely used for irrigation. In California more than forty thousand acres are irrigated from flowing wells. The average depth of these wells is about two hundred and fifty feet and the average discharge eighty thousand gallons per day. M. S. Hall. WHERE WE FOUND THE LADY-BIRDS. (A TRUE INCIDENT.)