This may be tested by allowing it to stand until it has acquired the ordinary summer temperature its various ingredients become ;

then manifest, palpable. These impurities are not caused by the additional heat they ;

exist at all times in the water ; their presence is only disguised for the moment by its coldness, and its injurious properties are in no wise diminished. Your inquiry as to the effects of impure water upon the human system, falls more properly within the province of the medical philosopher than the naturalist we do not, ;

therefore, feel ourselves called upon in this place to enter upon this subject farther than to state, that in several diseases, such as dyspepsia, and those bowel complaints of children, which carry off so many annually, the cure is retarded by the daily use of bad water. In the latter disease, in particular, the mode of cure often resorted to, is a change of air, which is supposed to be the chief agent in removing the disease. It is within the knowledge of some of the committee, that the use of pure water alone, without removal, has produced an almost immediate and beneficial change. From all which has been previously stated, you will learn that it is the unanimous opinion of the committee, that no adequate supply of good or wholesome water can be obtained on this Island, for the wants of a large and rapidly increasing city like New York. The various perforations which have been made, in the absence of all other proof, would sufficiently establish this position. These have been undertaken without any acquaintance with those immutable laws of nature, which regulate the position of rocks, and their utter uselessness is now sufficiently obvious. They- may be carried to any assignable depth in this rock, and when completed, will be merely reservoirs to receive the drainage from above.