The natural secretions of the human stomach are acid, and the acidity is subservient to the digestive functions. It cannot be superseded by artificial alkalinity without serious disturbance of nutrition; and the aim of treatment, in the case of all digestive derangements, should be to cure them by changing the conditions under which they arise, not to palliate them for a time by the neutralisation of acid, which may, indeed, give relief from present trouble, but which leaves unaltered the conditions upon which the trouble really depends. Those who look down the obituary lists of the newspapers will be struck by the fact that large numbers of people, in prosperous circumstances, die as sexagenarians from maladies to which various names are given but which are, as a rule, evidences of degeneration and of premature senility, while many who pass this period go on to enter upon an eighth or ninth decade of life. The former class, we have no doubt, comprise those who have lived without restraint of their appetites, and who have sought to allay some of the consequences thence arising by self-medication, while the latter class comprises those who have lived reasonably, and who, if annoyed by imperfect digestion, have sought relief by ascertaining and by abandoning the errors from which it sprang." Among the most pernicious and dangerous of all the patent medicines on the market are the so-called "Headache Powders," whose almost instantaneous effects testify to the potency of the drugs they contain. Such powerful agents carry their own condemnation, for they cannot in the nature of things _remove the cause_ of the pain; hence their action is limited to narcotising the nerves. The disease continues, the damage goes on, but the faithful sentinels are put to sleep. These headache powders so increased the deaths from heart failure in New York City a couple of years ago that it became necessary to warn the public against them. Memory, Loss of.--A more or less complete suspension of this faculty is a not uncommon form of mental and bodily illness. We do not so much mean the mere fading of past impressions as the loss of power to recall them, so that we cannot recall what we wish to remember. This is a result of any serious bodily weakness. It will come on through any exhausting exertion, or prolonged and weakening illness. Stomach disorder will also cause it. In this last case, drinking a little hot water at intervals will usually put all right. A cup of very strong tea will so derange the stomach in some cases as to cause temporary suspension of memory. We mention these cases to prevent overdue alarm at a perhaps sudden attack. The loss of mental power in such cases does not always mean anything very serious. Just as the stomach affects the memory, so also much use of memory and mental strain tells severely upon the stomach. Digestive failures in strictly temperate persons often arise from an overstrain of the mind.