It has already been observed, that at the age of puberty, the growth usually ceases. It often happens, however, that in the course of a tedious illness, the body increases more in length, than would have been the case in a state of perfect health. This is probably occasioned by the external organs of generation remaining without action during that period. The organic nutriment, having no irritation to determine it to those parts, does not reach them; and the want of this irritation is owing to an imbecility and lassitude of the parts, which prevent the secretion of the seminal fluid. As the organic particles, therefore, remain in the mass of blood, the extremities of the bones are necessarily enlarged, nearly in the same manner as those of eunuchs. Thus young people, on their recovery from along course of sickness, are frequently taller, but worst shaped, than formerly. Some, for instance, become crooked-backed, others crook-legged; and this, because the still ductile extremities of the bones have been necessarily extended by the superfluity of the organic particles, whose only office, in a state of health, would have been the formation of the seminal fluid. To produce children is the object of marriage, though this object is sometimes frustrated. Among the different causes of sterility there are some alike common to men and women; but as in men they are more apparent, to men they are more commonly attributed. In both sexes, sterility is occasioned either by an inherent defect in the conformation of the organs, or by accidental injuries to the organs themselves. Among men, the most essential imperfections in the conformation are those which affect the testicles, or those parts called the _erectores penis_. The false direction of the urethra, which is sometimes not only oblique, but badly perforated, is another obstacle to generation; as is the adherence of the prepuce to the bridle, which may, however, be corrected. In women, the conformation of the matrix may likewise be imperfect; and the perpetual closure or expansion of the orifice of the matrix, are defects which are alike repugnant to generation. But the most frequent cause of sterility, both in men and women, is the corruption of the seminal liquid in the _testes_; for if the secretion, by which the semen be formed, is vitiated, the fluid must be incapable of impregnation; in which case, though the organs may have every appearance of being properly qualified for it, there will be no procreation; but these causes have no external appearance.