In order to prevent many of the diseases to which cattle are liable, it is important that they be supplied with pure water. Cattle have often been known to turn away from the filthy fluid found in some troughs, which abound in slime and decayed vegetable matter; and, indeed, the common stagnated pond water is no better than the former. Such water has, in former years, proved itself to be a serious cause of disease; and, at the present day, death is running riot among the stock of our western, and also our northern farmers, when, to our certain knowledge, the cause exists, in some cases, under their very noses. The farmers ofttimes see their best stock sicken and die without any apparent cause; and the cattle doctors are running rough-shod through the _materia medica_, pouring down the throats of the poor brutes salts by the pound, castor oil by the quart; aloes, lard, and a host of kindred trash, follow in rapid succession, converting the stomach into a sort of apothecary's shop; setons are inserted in the "dewlap;" the horns are bored, and sometimes sawed off; and, as a last resort, the animals are blistered and bled. They sometimes recover, in spite of the violence done to the constitution; yet they drag out a low form of vitality, living, it may be said, yet half dead, until some friendly epidemic puts a period to their sufferings. The author's attention was first called to this subject on reading an article in an English work, the substance of which is as follows: A number of working oxen were put into a pasture, in which was a pond, considered to abound in good water. Soon after putting them there, they were attacked with scouring, upon which they were immediately removed to another field. The scouring continued. They still, however, drank at the same pond. They were shifted to another piece of very sweet pasture without arresting the disease. The farmer thought it evident that the pastures were not the cause of the disease; and, contrary to the advice of his friends, who affirmed that the spring was always noticed for the excellence of its water, fenced his pond round, so that the cattle could not drink; they were then driven to a distance and watered. The scouring gradually disappeared. The farmer now proceeded to examine the suspected pond; and, on stirring the water, he found it all alive with small creatures. He now stirred into the water a quantity of lime, and soon after an immense number of animalculæ were seen dead on the surface. In a short time, the cattle drank of this water without any injurious results.