Desirous of obtaining, if possible, a more exact notion than even a physician could give of the German, traditional method of managing the catamenial function for the first few years after its appearance, I made inquiries of a German lady, now a mother, whose family name holds an honored place, both in German diplomacy and science, and who has enjoyed corresponding opportunities for an experimental acquaintance with the German regimen of female education. The following is her reply. For obvious reasons, the name of the writer is not given. She has been much in this country as well as in Germany; a fact that explains the knowledge of American customs that her letter exhibits. MY DEAR DOCTOR,--I have great pleasure in answering your inquiries in regard to the course, which, to my knowledge, German mothers adopt with their daughters at the catamenial period. As soon as a girl attains maturity in this respect, which is seldom before the age of sixteen, she is ordered to observe complete rest; not only rest of the body, but rest of the mind. Many mothers oblige their daughters to remain in bed for three days, if they are at all delicate in health; but even those who are physically very strong are obliged to abstain from study, to remain in their rooms for three days, and keep perfectly quiet. During the whole of each period, they are not allowed to run, walk much, ride, skate, or dance. In fact, entire repose is strictly enforced in every well-regulated household and school. A German girl would consider the idea of going to a party at such times as simply preposterous; and the difference that exists in this respect in America is wholly unintelligible to them. As a general rule, a married woman in Germany, even after she has had many children, is as strong and healthy, if not more so, than when she was a girl. In America, with a few exceptions, it appears to be the reverse; and, I have no doubt, it is owing to the want of care on the part of girls at this particular time, and to the neglect of their mothers to enforce proper rules in this most important matter. It has seemed to me, often, that the difference in the education of girls in America and in Germany, as regards their physical training, is, that in America it is marked by a great degree of recklessness; while in Germany, the erring, if it can be called erring, is on the side of anxious, extreme caution. Therefore beautiful American girls fade rapidly; while the German girls, who do not possess the same natural advantages, do possess, as a rule, good, permanent health, which goes hand-in-hand with happiness and enjoyment of life. Believe me, Very truly yours, ---- ----. JUNE 21, 1873.