. The testimony of the rocks; . lder relief than that in w^hich it could have ap-peared to the poet himself: — \ From harmony, from heavenly harmony, \ This universal frame began; j From harmony to harmony, - \ Through all the compass of the notes it ran, / The diapason closing full in man. In the limits to which I have restricted myself, I havebeen able to do httle more than simply to chronicle thesuccessive eras in which the various classes and divisions ofthe organic kingdom, vegetable and animal, make theirappearance in creation. I have produced merely a briefrecord of the various buths, i
. The testimony of the rocks; . lder relief than that in w^hich it could have ap-peared to the poet himself: — \ From harmony, from heavenly harmony, \ This universal frame began; j From harmony to harmony, - \ Through all the compass of the notes it ran, / The diapason closing full in man. In the limits to which I have restricted myself, I havebeen able to do httle more than simply to chronicle thesuccessive eras in which the various classes and divisions ofthe organic kingdom, vegetable and animal, make theirappearance in creation. I have produced merely a briefrecord of the various buths, in their order, of that greatfamily whose father is God. And in pursuing such a plan,much, of necessity, must have been omitted. I oughtperhaps to have told you, that very rarely, if ever, do themaster forms of a period constitute the prevailing or typical12 13i THE PALJEONTOLOGICAL organisms of its deposits. Of the three great di^dsions ofwhich the geologic scale consists, — Palaeozoic, Secondary, Fig. 77. Fig. 78. Fig. ASAPHUS CAUDATDS. i Silurian.) ORTHOCERAS SPIRIGERINA RETICULARIS. LATERALE. (Mountain Limestone.) (Old Red Sandstone.) and Tertiary, — the first, or ichthyic period, is markedchiefly, not by its great fishes, but by the peculiar character Fig. 80. Fig. 81. Fig, 82. Fig. 83. mu
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