A correspondent (Wm. Collier) of the “London Mining Journal” imparts a piece of valuable information respecting the beneficial effects of lime-water to cure persons affected with carbonic acid gas. He states that two of his workmen were employed to clean out a " carbonator,"a large iron cylinder, 15 feet deep and 8 feet diameter, which was used at his chemical works, and through which a current of carbonic acid gas passed from a neighboring lime-kiln. This current of gas should have been shut off while the men were at work, but in this instance, by some neglect, it was not, so that when one of the men went down to the bottom to work, he dropped on his back, and could not answer the man at the top who was to assist at the operation. The latter made the alarm and said, ' the other had dropped down dead." Mr. Collier immediately directed a man to go down and lash a rope around the body of the man at the bottom of the " carbonator," who was then hoisted out, but life appeared to be extinct. He was at once carried to the fresh air, and some fresh lime-water was procured, but it was difficult to get his teeth apart as they were firmly set. At last Mr. C. got his mouth open so as to introduce two tea-spoonstull of the lime-water, which began to exhibit some effect. A little more was applied, which went down his throat, and he immediately, but imperfectly, began to breathe. A third time the lime water was given, as he was now able to drink, and he then began to breathe freely. He was then lifted up and made, with some assistance, to walk round about. In half an hour afterwards, he walked home, went to bed, slept, and next morning felt nothing the worse except his having a slight headache. This is an important fact in chemistry, as it relates to life, its dangers, and preservation, it is wettiiwwn to chemists thai lime water has a very great affinity for carbonic acid, and whenever it comes in contact with that gas, it immediately absorbs it, forming a precipitate of the carbonate of lime, or if the lime water is kept still in a large vessel the carbonate forms in a thin scale on the top, such as on bleachers' lime and dyer's vdts. In the case herein described, the lime water no doubt combined with the carbonic acid gas inhaled by the workman, and the carbonate oflime an inert substancewas formed ; it therefore appears to us, that lime water is an antidote to be employed lor those who are injuriously affected with inhaling carbonic acid gas. Those who work at lime-kilns, where much carbonic acid g?s is developed, have a remedy in the material which is continually passing through their hands. Those who labor at charcoal pits, have also a remedy for the injurious effect of the gas of the coal, in a bottle of lime water. To make good lime water for the purpose, it must be prepared from fresh burned lime. Take about half a pound of fresh burned lime, and pour about five quarts of clear soft water upon it; stir up the lime quickly, cover up the vessel, and set it aside for about two hours. The clear should then be poured out into clean bottles and well stoppered, so as to exclude all the air. Hot water is not necessary for this purpose, as lime is as soluble in cold, and a quart will hold about 32 grains of lime in solution. Those whose business leads them to work much over a charcoal fire, will find it for their advantage to have a bottle of lime water always at hand. It would be well for a person who is about to descend into a well to clear it out, first to throw down a few pailsful of fresh lime water, in order to absorb any free carbonic acid gas which maybe at the bottom. On three separate occasions we have been severely affected with carbonic acid gas, by working over a large charcoal fire, and although we were well acquainted with the al-finity of lime water for it, we never on any of those occasions thought to try it as a remedy. The substances we used were emetics, with the free use of cold water poured upon the head, and by chafing the chest. We hopi this notice will direct general attention ti this subject; every thing useful connectei with the preservation of lifea remedy fo an illshould be known and read of all men