I.

It is always difficult to determine the natural duration of life, or the death-rate for any locality or any class of people, since the range of circumstances that affect the health of men and animals is so vast, that it requires great research, powers of analysis and comparison; so extensive a knowledge of the phenomena and the laws of life, that few men have the courage to attack, or the ability to comprehend and solve the complex problem.

In our estimations we must consider what is due to the agencies of the natural world, such as geology, meteorology, and the like, as well as to age, constitution, temperament, anterior professions, and morbid predispositions, also the exaltation and demoralization of moral action.

"We see," says Buffon, "that man perishes at all ages, while animals appear to pass through the period of life with firm and steady pace." The great naturalist shows how the passions, with their attendant evils, exercise great influence upon the health, and derange the principles which sustain us; how often men lead a nervous and contentious life, and that most of them die of disappointment. Buffon is right, and the English statistics show us that the duration of life is generally in proportion to its happiness and regularity, and that miserable lives are soon extinguished.

Hope sometimes forsakes the stoutest hearts, and with hope disappears the mainspring of earthly life.