"The crust of our earth is a great cemetery, where the rocks are tombstones on which the buried dead have written their own epitaphs."

“The facts will eventually test all our theories, and they form, after all, the only impartial jury to which we can appeal.”

“The time has come when scientific truth must cease to be the property of the few, when it must be woven into the common life of the world.”

“Foldings of the earth's crust, low hills, extensive plains, mountain-chains and narrow valleys, broad table-lands and wide valleys, local chimneys or volcanoes, river-beds, lake-basins, inland seas,—such are some of the phenomena which, disconnected as they seem at first glance, have nevertheless been brought under certain principles, and explained according to definite physical laws.”

“The eye of the trilobite tells us that the sun shone on the old beach where he lived; for there is nothing in nature without a purpose, and when so complicated an organ was made to receive light, there must have been light to enter it.”

“But whatever its defects, the classification of Linnæus was the first attempt at grouping animals together according to certain common structural characters.”

“Every great scientific truth goes through three stages. First, people say it conflicts with the Bible. Next they say it has been discovered before. Lastly they say they always believed it.”