"It was soon ascertained that antipyrin, antifebrin, phenacetin and other analogous products, if given in sufficient doses, would reduce the heat, and allay the pains with great certainty and promptness, not only in continued fevers, but also in rheumatism, influenza, or la grippe, etc.; and thus their use soon became popular with both the profession and the public. No one, however, undertook to first ascertain by strictly scientific appliances the actual pathological processes causing the pyrexia in each form of disease, or even to determine whether in any given case the increased heat was the result of increased heat production, or diminished heat dissipation. Neither were any of the remedies subjected to such experimental investigation as to determine their influence on the elements of the blood, the internal distribution of oxygen, the metabolism of the tissues, or on the activity of the eliminations. Consequently their exhibition was wholly empirical, and the one that subdued the pyrexia most promptly was given the preference. Yet we all know that the pyrexia invariably returned as soon as the effects of each dose were exhausted, and in a few years the results showed that while the antipyretics served to keep down the pyrexia, and give each case the appearance of doing well, the average duration of the cases, and their mortality, were both increased. "Step by step experimental therapeutic investigations have proved that the whole class of coal-tar antipyretics reduce animal heat by impairing the capacity of the hemoglobin and corpuscular elements of the blood to receive and distribute free oxygen, and thereby reduce temperature by diminishing heat production, nerve sensibility and tissue metabolism. Therefore, while each dose temporarily reduces the fever, it retards the most important physiological processes on which the living system depends for resisting the effects of toxic agents; namely, oxidation and elimination. This not only encourages the retention of toxic agents and natural excretory materials by which specific fevers are protracted, but it greatly increases the number of cases of pneumonia that complicate the epidemic influenza, or la grippe, as it has occurred since 1888-89. "The bad work that people make in dosing themselves with patent medicines, without a physician's prescription is not unfrequently punctuated with a sudden death from overdosing with antipyrin, sulphonal, or some other coal-tar preparation." Dr. C. H. Shepard, Brooklyn, N. Y., says:--