In this bottle, which holds six ounces, I have placed some of this colored water, which represents about the quantity which is pumped out of the heart of an adult each time the pulse beats. As I have already intimated to you, the heart is double, and at each throb about one-half the quantity in this bottle is pumped out by the right side, and the other half by the left side of the heart. Now, if the heart were to pump different blood with each pulsation, instead of pumping the same blood over and over again, in twenty-four hours the heart of a man of ordinary size would pump 150 barrels of blood. [Illustration: A Wagon Load of Barrels.] The Bible says that the days of our years are three-score years and ten, or, in other words, that the allotted period of an ordinary life is 70 years. Now, in 70 years the heart would pump 164,389,786 gallons; or, to give it to you in barrels, it would make 4,566,382 barrels. If you were to place six barrels on a wagon, and this would make a good load for two horses, you would have 761,063 loads of these barrels. If you were to place these teams, with the wagons containing six barrels apiece, with 36 gallons each, at a distance of 25 feet apart, it would make a string of teams stretching away 1,778 miles, or as far as from New York City to Des Moines, in the state of Iowa, or from New York City down to the Gulf of Mexico. I think you will now be able to understand what a wonderful little steam engine and pump each of us has within our own breast. And it may surprise you when I tell you that Dr. Buck says that the heart at each throb beats with a power equal to 100,000 pounds. An ordinary engine or pump would soon wear out, but this little engine of the heart goes on beating day and night from the time we are born until we are 70 years of age, if we live to be that old, and even while we rest in sleep, the heart never stops for a moment. Is it any wonder that David said that "We are fearfully and wonderfully made"? I might tell you many other wonderful things about the heart, but this will have to suffice. If the natural heart in these bodies of ours is so wonderful, how much more wonderful still is that heart which is the seat of the moral life and character? As the natural heart is hidden away in these bodies of ours, so the spirit or the soul is spoken of in the Bible as the heart, because it is hidden away in the life which we have in these bodies of ours; and it is this moral character and spiritual life to which the Bible refers when it says, "Keep thine heart with all diligence, for out of it are the issues of life."