The _temperaments_ exert over reproduction, as over all the other functions of the body, a powerful influence. Love is said to be the ruling passion in the sanguine temperament, as ambition is in the bilious. There is also in some cases a peculiar condition of the nervous system which impels to, or diverts from, sexual indulgence. In some women, even in moderation, it acts as a poison, being followed by headache and prostration, lasting for days. With advancing years, the fading of sexual desire calls attention to the general law, that animals and plants, when they become old, are dead to reproduction. What in early life is followed by temporary languor, in matured years is succeeded by a train of symptoms much graver and more durable. Those who are in feeble health, and particularly those who have delicate chests, ought to be sober in the gratification of love. Sexual intercourse has proved mortal after severe hæmorrhages. All organized beings are powerfully affected by propagation. Animals become depressed and dejected after it. The flower which shines so brilliantly at the moment of its amours, after the consummation of that act, withers and falls. It is wise, therefore, in imparting life, to have a care not to shorten one's own existence. Nothing is more certain than that animals and plants lessen the duration of their lives by multiplied sexual enjoyments. The abuse of these pleasures produces lassitude and weakness. Beauty of feature and grace of movement are sacrificed. When the excess is long continued, it occasions spasmodic and convulsive affections, enfeeblement of the senses, particularly that of sight, deprivation of the mental functions, loss of memory, pulmonary consumption and death. One of the most eminent of living physiologists has asserted that 'development of the individual and the reproduction of the species stand in a reverse ratio to each other,' and that 'the highest degree of bodily rigor is inconsistent with more than a very modest indulgence in sexual intercourse.' The general principles we have just enunciated are of great importance in the regulation of the health. They are more suggestive and useful than the precise rules which have from time to time been laid down on this subject. TIMES WHEN MARITAL RELATIONS SHOULD BE SUSPENDED. There are times at which marital relations are eminently improper. We are told, I Cor. vii. 3, 4, that neither husband nor wife has the power to refuse the conjugal obligation when the debt is demanded. But there are certain legitimate causes for denial by the wife. A condition of intoxication in the husband is a proper ground for refusal. Fecundation taking place while either parent has been in this state has produced idiots and epileptics. This has happened again and again. The cases on record are so numerous and well-authenticated, as to admit of no doubt in regard to the fatal effect upon the mind of the offspring of conception under such circumstances.