Other causes besides climate tend to hasten the occurrence of this change, as habits, temperament, constitutional tendency, education, and idiosyncrasy.

Habits of vigorous physical exercise tend to delay the access of puberty. For this reason, together with others, country boys and girls generally mature later than those living in the city by several months, and even a year or two. Anything that tends to excite the emotions hastens puberty. The excitements of city life, parties, balls, theaters, even the competition of students in school, and the various causes of excitement to the nervous system which occur in city life, have a tendency to hasten the occurrence of the change which awakens the sexual activities of the system into life. Hence, these influences cannot but be considered prejudicial to the best interests of the individual, mentally, morally, and physically, since it is in every way desirable that a change which arouses the passions and gives to them greater intensity should be delayed rather than hastened.

[Influence of Diet on Puberty.]—The dietary has a not unimportant influence in this respect. Stimulating food, such as pepper, vinegar, mustard, spices, and condiments generally, together with tea and coffee, and an excess of animal food, have a clearly appreciable influence in inducing the premature occurrence of puberty. On this account, if on no other, should these articles be prohibited to children and youth, or used very sparingly. Those who advocate the large use of meat by children and youth have not studied this matter closely in all its bearings. While it is true that children and growing youth require an abundance of the nitrogenous elements of food which are found abundantly in beefsteak, mutton, fish, and other varieties of animal food, it is also true that in taking those articles of food they take along with the nutrient elements properties of a stimulating character, which exert a decidedly detrimental influence upon the susceptible systems of children and youth. At the same time, it is possible to obtain the same desirable nitrogenous elements in oatmeal, unbolted wheat flour, peas, beans, and other vegetable productions, which are wholly free from injurious properties. We are positive from numerous observations on this subject, that a cool, unstimulating, vegetable or farinaceous diet would deter the development of the sexual organism for several months, and perhaps for a year or two.

While it might not be in all cases desirable to do this, it would at least be wise to adopt such measures in cases in which the child is unavoidably exposed to influences which have a tendency to hasten the change.

It is important to add in this connection a word of caution against the adoption of a dietary too abstemious in character. It is necessary that an abundance of good, wholesome food, rich in the elements of nutrition, should be taken regularly. There is no doubt that many young ladies have induced conditions of serious disease by actual starvation of the system. A young woman who attempts to live on strong tea or coffee, fine-flour bread, and sweet cake, is as certainly starving herself as though she were purposely attempting to commit suicide by means of starvation, and with as much certainty of the same result.

[Brunettes Naturally Precocious.]—It has been observed that in girls the occurrence of puberty is earlier in brunettes than in blondes; and in general it makes its appearance earlier in persons of a nervous or nervo-bilious temperament than in persons of a lymphatic temperament or phlegmatic nature.

Certain nationalities and families are marked by the earlier occurrence of puberty than in others. In Jews, the change is commonly a year or two in advance of other nationalities in this country. It also occurs somewhat sooner in negroes and creoles than in white persons, the African race seeming to retain something of the precocity occasioned by the tropical influence of its native clime.

[Remarkable Precocity.]—Cases occasionally occur in which puberty makes its appearance at the age of three or four years. Indeed, a case has been reported in this country in which a female child possessed all the characteristics which are usually developed at puberty, from birth. In this case the regular periodical changes began at birth.

[Premature Development Occasions Early Decay.]—A fact which is of too great importance to allow to pass unnoticed, is that whatever occasions early or premature sexual development, also occasions premature decay. Females in whom puberty occurs at the age of ten or twelve, by the time their age is doubled, are shriveled and wrinkled with age. At the time when they should be in their prime of health and beauty, they are prematurely old and broken. Those women who mature late retain their beauty and their strength many years after their precocious sisters have become old, decrepit, and broken down. Thus, the matrons of thirty and forty years in colder climates are much more attractive in appearance than the maidens of sixteen; while quite the reverse is true in this and other countries where sexual development is unduly hastened.