All geologic history is full of the beginning and the ends of species-of their first and last days; but it exhibits no genealogies of development.

Problems are only opportunities with thorns on them.

Poets need be in no degree jealous of the geologists. The stony science, with buried creations for its domains, and half an eternity charged with its annals, possesses its realms of dim and shadowy fields, in which troops of fancies already walk like disembodied ghosts in the old fields of Elysium, and which bid fair to be quite dark and uncertain enough for all the purposes of poesy for centuries to come.

The six thousand years of human history form but a portion of the geologic day that is passing over us: they do not extend into the yesterday of the globe, far less touch the myriads of ages spread out beyond.

Life itself is a school, and Nature always a fresh study.

Nature is a vast tablet, inscribed with signs, each of which has its own significancy, and becomes poetry in the mind when read; and geology is simply the key by which myriads of these signs, hitherto indecipherable, can be unlocked and perused, and thus a new province added to the poetical domain.

It is an excellent circumstance that hospitality grows best where it is most needed. In the thick of men it dwindles and disappears, life fruit in the thick of a wood; but where people are planted sparely it blossoms and matures, like apples on a standard or an espalier. It flourishes where the inn and lodging-house cannot exist.