Diarrhea and Dysentery from Impure Water.  — the instances of outbreaks of these two diseases from contaminated water supply are very numerous, and probably most persons can recall examples of this kind.  The impurities which produce diarrhea and dysentery are suspended earthy matters, such as are found in most river waters after a rain; suspended [...]

Second Use of Breathing. –Nor is the stupendousness all. Nature dislikes a waste of energy. In addition to and by a wise adaptation and economy, the process of respiration is made to sub serve a second use no less important than that of purifying the blood — the power of speech. The exhaled air, laden [...]