Genesis 1:7

God made the firmament. — This wide open expanse upon earth’s surface, supplied by the chemistry of nature — that is, of God — with that marvellous mixture of gases which form atmospheric air, was a primary necessity for man’s existence and activity. In each step of the narrative it is ever man that is in view; and even the weight of the superincumbent atmosphere is indispensable for the health and comfort of the human body, and for the keeping of all things in their place on earth. (See Note, Genesis 1:8.) And in this secondary sense it may still rightly be called the firmament.

The waters which were under the firmament... the waters which were above the firmament. — While this is a popular description of what we daily see — namely, masses of running water congregated upon earth’s surface, and above a cloudland, into which the waters rise and float — it is not contrary to, but in accordance with, science. The atmosphere is the receptacle of the waters evaporated from the earth and ocean, and by means of electrical action it keeps these aqueous particles in a state of repulsion, and forms clouds, which the winds carry in their bosom. So full of thoughtful contrivance and arrangement are the laws by which rain is formed and the earth watered, that they are constantly referred to in the Bible as the chief natural proof of God’s wisdom and goodness. (See Acts 14:17.) Moreover, were there not an open expanse next the earth, it would be wrapped in a perpetual mist, unvisited by sunshine. and the result would be such as is described in Genesis 2:5, that man could not exist on earth to till the ground. The use, however, of popular language and ideas is confessedly the method of Holy Scripture, and we must not force upon the writer knowledge which man was to gain for himself. Even if the writer supposed that the rains were poured down from an upper reservoir, it would be no more an argument against his being inspired than St. Mark’s expression, “The sun did set” (Mark 1:32), disproves the inspiration of the Gospels. For the attainment of all such knowledge God has provided another way.