From this examination the conclusion follows, that it is a water containing a very minute quantity of solid ingredient. In one thousand parts the specific gravity is only 2/10 higher than that of distilled water. From the nitrate of silver causing so slight a change, we see that the water is almost free from the muriates. It is evident that the chief solid ingredients are the sulphate and the carbonate of lime. Although I should certainly consider that a water still less impregnated with these salts, and especially the sulphate of lime, would be more wholesome, yet, when the small proportion existing in this water is estimated, I am led to the conclusion, that the disorder of the digestive organs, which commonly happens to the visitors of Paris, is not attributable to the water of the Seine, but to the new mode of living, and above all to the free, and sometimes intemperate, use of the light acid or acescent wines. In such cases, weak brandy and water should be substituted, and if wine be taken, care should always be observed to procure such as is of the best quality, and the most free from acid. Since the printing of the sheets on the subject of the stethoscope, I have met with many interesting and important cases, proving to my further and complete satisfaction the value of the indications afforded by the instrument. In reverting to the subject, I shall offer a concise account of two instances in which I derived an accuracy of instruction for my treatment, which I could not otherwise have obtained. A lady fifty years of age, who enjoyed good health generally, and was not subject to cough, had been ill with symptoms of pneumonia and bronchitis, a week before I was consulted. I found the following symptoms: the pulse frequent, hard, and rather full; the skin hot; cheeks flushed; the tongue much furred; the urine high-coloured, not depositing sediment; the bowels torpid; cough rather occasional than constant, but for the most part violent; the expectoration copious and muco-puriform. In the upper parts of the right and left sides of the chest, the indications afforded by the stethoscope were, very sharp and strong sounds, both in inspiration and expiration, conjoined with the mucous rattle. She did not experience any pain, nor any sensible difficulty of respiration, although it was evident that she did not breathe naturally; and fits of coughing were easily excited. Her countenance had a very feverish and anxious look. Previously to my visit she had been bled only once.