The only true source of caloric in animals, is that produced by the chemical combination of oxygen with the carbon and other oxidizable products of their system. Every cause which quickens and exalts this chemical action increases the animal heat, whilst every interfering cause produces cold and chilliness. It is in this way that drinking cold water, or taking exercise in the open air, increases the warmth of the body, by producing a healthy [13] waste of the system, and so stimulating the chemical combustion within it. Clothing, it should be recollected, has merely the effect of retaining animal heat and preventing its dissipation, but it cannot, in the slightest degree, create it: if, therefore, any thing occurs to interfere with that action, by which heat can alone be generated, all the clothes in the world will fail to warm us. How little these facts are reflected on, is shown by the excessive and injurious amount of clothing worn by delicate persons, which defeats the very object they are intended to effect. These facts also explain the apparent paradox of patients who, previous to undergoing the water system, complain of chilliness when smothered with clothing, but who afterwards are enabled to wear very light clothing, without any feeling of their former chilliness. [14] On this subject Dr. Gully observes:— “Should, however, the reader desire to learn the most effectual way of destroying the power of generating animal heat, let him pursue the plan which so many shivering patients who come to Malvern have followed. Let him drink spirits and wine, eat condiments, swallow purgatives, and especially mercurials, take a ‘course of iodine,’ and, as an occasional interlude, lose a little blood, and we stake our reputation that he will shiver to his heart’s content, and find himself many degrees lower in the scale of Fahrenheit than cold water, cool air, early rising, and exercise can possibly make him.” Before leaving this subject, we would entreat our readers seriously to consider the observations we have addressed to them, and the facts which we have adduced in support of the mode of treatment which we have advocated. The subject is one of serious moment, since, on this disease being rightly understood, the lives of millions of our countrymen depend. If a rational mode of treatment be adopted, its fearful ravages may be successfully encountered and stayed, but if not, the gaunt spectre will stalk as hitherto, unchecked through the length and breadth of our island, dealing death to millions of its sons. With regard to water drinking, an important part of the Hydropathic process, and against which much prejudice exists, the following extracts from the pen of the justly celebrated Allopathic physician, Sir Henry Holland, will not, we hope, be considered out of place. In his work styled “Medical Notes and Reflections,” treating of “Diluents,” he thus writes: