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large. There are many arid districts in various parts of the earth where water could be found at various depths in certain spots, but until the period of the discovery in question, about five years ago, there was nothing to guide the anxious seeker for this prime necessity of life unless water appeared somewhere on the surface near the place of experiment, and much labour has been wasted in anxious hopes, often doomed to disappointment, of striking a spring at certain depths in some chosen spot. Many of these sterile districts could be changed into fertile plains if irrigated by the wells that might be sunk there or in the adjacent vicinity where no indications of water exist on the surface. " In the far west there are large tracks of sage, brush, and alkali lands, for instance, which are comparatively worthless in their present condition, but could be made to produce excellent crops if watered from wells that might be sunk in those sections. " There are many districts in which agriculture languishes, and where the soil affords but a poor subsistence, which could be transformed into productive fields by the system of discovering water, and consequent irrigation. In fact agriculture in almost every department can be made more remunerative by the certainty of water on the farm, or approximate enough to be obtained in case of need. " Again, almost every industry, both mining and manufacturing, is more or less dependent on an abundant supply of water for its productiveness and success. In an especial degree this is true of placier-mining, which cannot be developed, and may already have had to be discontinued also in localities where gold was abundant in the gravel, on account of scarcity of water. This industry affords an example where it will pay to take the water even a long way from the point of location, and where gushing springs at great depth near the locality of the previous gravel are of inestimable value. " There is a very large amount of money lost every year in boring and digging for water, without any satisfactory results; but this loss, though great, is but a drop in the bucket compared with the immense gain that would accrue in extra productiveness in all the great industries, if this method of discovering water were general and could be utilised in every section of the land. And there is no reason why it should not become universal. It can be placed within the reach.of all who are in need of it. The beauty of it is that it pays expenses as it goes, and in most instances immediately creates large profits compared with the outlay of introducing and adopting it. " The two gentlemen who are now the exclusive proprietors of the secret have already extended their experiments over a wide domain both in United States of America and Europe, and Mr. B. A. Hervey, of 144, Clarence Street, Sydney, is acting as sole agent for the patentees in Australasia. The inventors have got their Indicator now to the point of thorough practicality, far beyond the boundary of experiment. Profitable practical tests are the most convincing things in the world. A large number of such people bear testimony to the facts and remunerative results of this great discovery. The marvellous Water Indicator, however, speaks for itself, and seems to be infallible in its power to locate liquids in motion. So it may be said of this apparatus in a still more emphatic sense than has been stated of the photographic camera, that the instrument cannot lie. " The best testimony to substantiate this has been obtained from a host of witnesses; but two are especially worthy of note, one in Moscow and the other in New York. The party in Moscow was Julius Baerlein, quite sceptical regarding the power of Mr. Heerdegen's discovery. They were a cotton firm, and had just begun to dig an artesian well. Mr. Heerdegen, after placing his Indicator on the spot, informed them that there was no water in that particular place at any depth, but they laughed him to scorn, and persisted to bore to the depth of 46ft. without any result. Mr. Heerdegen then pointed out a place on the same property where the instrument indicated water at a depth of 21ft.,'and where it distinguished two streams that joined at a certain point. There the sceptics, after some remonstrance, began to dig, and, when they reached the exact depth indicated, water gushed forth, and further investigation showed that the two streams joined exactly as foretold by the apparatus. The water was abundant and of excellent quality. " The New York experiment was on the premises of the Huepfel Brewery, on St. Anne's Avenue, Morrisania. The Messrs. Huepfel had bored for an artesian well a few years ago to the depth of 1,300 ft. without success. In December, 1889, Mr. Heerdegen went over the Huepfel premises with his Indicator and struck water, which he said would be found at a depth of between 30ft. and 40ft. Boring was begun, and at 25ft. a rock was struck of a few feet in thickness, which being penetrated to 31ft., water rose freely to within 10ft. of the surface, and, on a pump being introduced, the well yielded 60 gallons a minute for 120 hours, and has become a permanent source of abundant supply, and is now saving $4,000 a year, formerly paid for Croton. Tests and testimonials might be multiplied so as to fill several pages of this paper, but we have only space in a condensed form for a limited number of the most striking, though all are indubitably convincing, of the infallibility of the Indicator. "Several prominent engineers were so much interested that they agreed to have the apparatus tested publicly. Messrs. Heerdegen and Schnee agreed to accept any terms proposed by the engineers to locate water, and went through a series of trials. " One of the most interesting tests was conducted on the new Croton Aqueduct, under the auspices of some of the engineers of the works, and two scientific gentlemen of the editorial staff of the Engineering News and the Engineering and Mining Journal, who were conversant with the location and direction of the tunnels which the Heerdegen Indicator placed with unerring accuracy in every instance. "The foregoing tests were followed by another test, which consisted in laying about 150 ft. of fin. stream-hose on the second floor of the Baub Building, at the corner of Nassau and Fulton Streets, New York, Mr. Heerdegen being stationed upon the third floor before the hose was uncoiled. This hose was passed through various rooms, and a stream of water sent through it, and Mr. Heerdegen succeeded more than fairly well in locating and tracing its course on the floor above."