We have clear proof that it was so from the vegetable soil still remaining, and the numbers of trees the remains of which are embedded in the rock, many of them standing upright as when growing.

The third layer seems to show, from the limestone and the fresh-water shells embedded in it, that the level land where the forest grew sank lower and lower until it formed a hollow which in time became a lake.

The fourth layer, which "ends this strange, eventful history," gives evidence of the whole land having been again covered by the ocean, and again raised above the waters!

If we were studying geology together, I should like to take you with me to the Museum, and we would first look at the fossils which are believed to belong to the most ancient time of life upon the earth; then we would pass on to those belonging to the second or "middle" stage, and then to the third, or "new" stage, letting these wonderful stones, taken from mountain height or deep sea bottom, or from the depths of the earth itself, tell their own eloquent story.

But what I should like you to remember is that geologists of our own time tell us that the lowest layer of the earth's crust which has yet been explored appears to be made of vegetable remains, so crushed and altered by time and by the tremendous pressure of rocky layers lying above it, that though it is probably of the same material as that which forms the coal-measures, it resembles the blacklead of which pencils are made much more than the coal which you know is what has been formed by the decay of buried forests and jungles.

In this layer of "graphite," geologists with the help of their microscopes have searched in vain for any trace of what once was living, but they think it may have been formed from the "flowerless" plants, or even from those still more lowly, too minute when living to be seen by the naked eye, and consisting of one tiny bag or "cell."

They tell us that these "infant" plants were followed by those of larger growth, specimens of which are found in layers of rock and clay nearer the surface, and are followed by remains of the "herb yielding seed, and the fruit tree yielding fruit after its kind"—for mummies of seed vessels and fruits have been found in coal-fields in many parts of the world.

It is interesting, too, to see that as far as we can tell at present, in the case of fossil-fish and other living creatures, the lowest forms are found first (that is, farthest back), and are followed by remains of creatures higher in the scale of life; that is to say, not so simple in structure. In using the words "higher" or "lower," we do not mean that there is anything imperfect about the humbler creatures; they are exactly suited to the life which has been given to them to live, but their form is very simple compared with that of "higher" animals, just as a three-legged stool is much more simple in its construction, and is made of fewer parts, than a watch. I may tell you a little about these lowly creatures when we speak of the FIFTH DAY of Creation, and then you will see that they were all made according to a "perfect goodly pattern" or plan, and each "after its kind"; for if we read the pages of the Stone Book aright, we shall see plainly written there that from the first beginnings of life, as far as it is given us to trace them, the goodness and wisdom and power of God are shown in the way in which the smallest creature of His hand is suited to the place appointed to it to fill, by Him who is "good to all," and whose "tender mercies are over all His works."

But there is a great difference between what we may thus glean from the study of the earth, and what is revealed to us by the clear teaching of the Word of God, as He tells us what He did in His wonderful work of Creation, and how He "saw everything that He had made, and behold it was very good."

When God speaks, all is clear and simple and true; and is to be understood by believing His word: when we come to the thoughts of men about what happened in the far past, especially when they try to settle not only the when but the how of His mighty working, much is dark uncertainty.