According to the “Encyclopædia Britannica,” “Luigi Cornaro (1467-1566) was a Venetian nobleman, famous for his treatises on a temperate life. From some dishonesty on the part of his relatives, he was deprived of his rank and induced to retire to Padua, where he acquired the experience in regard to food and regimen which he has detailed in his work. In his youth he lived freely, but after a severe illness at the age of forty, he began under medical advice gradually to reduce his diet. For some time he restricted himself to a daily allowance of 12 ozs. of solid food and 14 ozs. of wine. Later in life he still farther reduced his bill of fare, and he found that he could support his life and strength with no more solid meat than an egg a day. So much habituated did he become to this simple diet that when he was about seventy years of age the addition, by way of experiment, of 2 ozs. a day had nearly proved fatal. At the age of eighty-three he wrote his treatise on the ‘Sure and Certain Method of Attaining a Long and Healthful Life.’ And this work was followed by three others on the same subject, composed at the ages of eighty-six, ninety-one, and ninety-five, respectively. ‘They are written,’ says Addison (‘Spectator,’ No. 195), ‘with such a spirit of cheerfulness, religion, and good sense, as are the natural concomitants of temperance and sobriety.’ He died at the age of ninety-eight. Some say of 103! Now, was Luigi Cornaro right? Did he make use of a physiological process unknown to us of the value of which he was not cognisant? To live to an advanced age, must we be as temperate as he, reducing the quantity of our food to a minimum required by Nature? That we all eat more than we can assimilate is unquestionable. How can we determine the right quantity? Instinct _should_ guide us, but an abnormal appetite often leads us astray. Nature’s plans are perfect if her laws are obeyed. Disease follows disobedience. Wherein do we disobey? We live _not_ upon what we eat, but upon what we digest; then why should undigested food, recognisable as such, be deemed a normal constituent of our solid egesta?