[Footnote 319: "Le Count de Northumberland del age de XLV ans; armez de XXX ans." "Mons. Henr' de Percy del age de vynt ans, armez premierement, quant la chastell de Berwick etait pris par les Escoces, et quant le rescous fuist fait."] [Footnote 320: We cannot read the document on which these observations are founded without being reminded at how early an age in those times the youth of our country were expected to take up arms, and follow some experienced captain, or even themselves lead their warriors to the field. When Hotspur accompanied his father to the rescue of Berwick, he was only in his thirteenth year; his father had borne arms from the age of fifteen; and Henry of Monmouth (accompanied we know by a tutor or guardian, as probably Hotspur was at Berwick) was certainly in Wales, "chastising the rebels," soon after he had completed his thirteenth year. Another reflection, forced upon the mind by a familiar acquaintance with the political and the domestic history of those times, is on the very low average of human life at that period of the English monarchy. Few reached what is now called old age; and persons are spoken of as old, who would now be scarcely considered to have passed the meridian of life. It would form a subject of an interesting, and perhaps a very useful inquiry, were a philosophical antiquary (who would found his conclusions on a wide induction of facts, and not seek for evidence in support of any previously adopted theory,) to trace the existence, and operation, and extent of those causes, physical and moral, which exercise doubtless important influences over human life, and, under Providence, contract or lengthen the number of our days here. Unquestionably, such an investigator would immediately find many changes adopted in the present day conducive to longevity, in the structure of our habitations, the nature of our clothing, our habits of cleanliness, our food, comparative moderation in the use of inebriating liquors, with many other causes of health now believed to exist among us. To two causes of the average shortness of life, in operation through