In the more northern regions, as in Lapland, &c., this evacuation is generally delayed until the female has attained her eighteenth or nineteenth year: in the temperate latitudes the average period will be found from the fourteenth to the sixteenth year. A difference, will, nevertheless, be found in the women who may reside in cities, and in those who dwell in the country of each respective portion of the globe. It may also be observed, that in cold countries, women continue to menstruate for a longer period than in warm; and as a general rule, it will be found they are obnoxious to this discharge double the period that elapses before it commences. Thus, women who have not this discharge until eighteen, will be found to have it until beyond fifty; those who commence at fourteen or fifteen, will leave off at forty-five; those who begin so early as eight or nine, will have it cease at twenty-five or six.[2] On the appearance of the menses, or monthly turns, nature seems to perfect her work, both as regards development and proportion: it is the period of the most perfect beauty of which the female is susceptible; it is the one at which the moral changes are not less remarkable than the physical; it is a moment, of all others, the most replete with consequences to the inexperienced and confiding female. At this period a great variety of interesting and curious phenomena present themselves: the voice is found to change; the neck and throat to increase in size, and to become more symmetrical; the mammæ to swell; the nipple to protrude; the chest to expand; the eyes to acquire intelligence, and increase of brilliancy; in a word, a new being, almost, is created. The quantity of fluid expended at a menstruous period differs in different individuals; with girls who precociously menstruate, the quantity is in general smaller, and the returns less regular. Climate exerts an influence upon the quantity discharged, as well as upon the periods at which this evacuation shall commence. Thus, in the equatorial and more northern regions, it is less than in the more temperate climates. It is of importance for women to know that occasional irregularities are not always the consequences of disease. Constitutions vary as much in respect to the regular returns of this discharge, as they do with regard to their first appearance or final cessation. Those in whom the change occurs very early from vigor of constitution, require little to be done for them; but in weak and delicate habits, the non-appearance of this evacuation is too often considered as the cause, whereas it ought to be viewed as the effect, of the state of the habit unpropitious to its taking place. And, according to family practice, under this false impression, warm teas and forcing medicines are employed at the approach of this disease, which have often done much harm.