And here in the next century comes Schenck of Grafenberg, staggering under his monstrous volume of "Casus Rariores,"—ready to fall fainting by the wayside, when lo! the shining ones meet him too, and lift him and lighten him with the utterance of these fifty-one distinct poems which we see hung up on so many votive tablets at the entrance of this miniature Babel of Science.

Even so late as the last century the genial custom survived; for our worthy Stalpart van der Wiel, whose little pair of volumes was published in 1727, can boast of twenty-two pages of well-ordered commendatory verse, much of it in his native Dutch,—a little of which goes a good way with all except Batavian readers.

But as the "Arundines Cami," musical as they are, have lent no prelude to these harmonies of science, we must say in a few plain words of prose our own first thought as to the work the commencement of which lies before us. We believe, that, if completed according to its promise, it is to be one of the monumental labors of our century. Comparisons are not to be lightly instituted, and especially under circumstances that do not allow a fair survey of the whole field from which the objects to be compared are to be taken. We suppose, however, it will be conceded that the sunset continent has never witnessed anything like the inception of this mighty task in the way of systematic natural science. And if, since Cuvier, the greatest of naturalists, as Mr. Agassiz considers him, slept with the fossils to which he had given life, there has been any other student of Nature who has attempted a task so immense, with the same union of observing, reflecting, analyzing, and coördinating power, we cannot name him. Our civilization has a right to be proud of such an accession to its thinking and laboring constituency; it is also bound to be grateful for it, and to express its gratitude.

It is just one hundred years since another Swiss, the magnificent Albert von Haller, gave to the world the first volume of the "Elementa Physiologiae Corporis Humani." Nine years afterwards, in 1766, the last of the eight volumes appeared; and the vast structure, which embodied his untiring study of Nature, his world-wide erudition, his deepest thought, his highest imaginings, his holiest aspirations, stood, like the Alps whose shadow fell upon its birthplace, the lovely Lausaune, pride of the Pays de Vaud. The clepsydrae that measure the centuries as they drop from the dizzy cliffs—the glaciers, by the descent of which "time is marked out, as by a shadow on a dial," and which thunder out the high noon of each revolving year with their frozen tongues, as they crack beneath the summer's sun—have registered a new centennial circle, and at the very hour of its completion, Switzerland vindicates her ancient renown in these fair pages, at once pledge and performance, of another of her honored children. May the auspicious omen lead to as happy a conclusion!

Lovingly, then, we lay open the generous quarto and look upon its broad, bright title-page. It tells us that we have here the first of a series of "Contributions to the Natural History of the United States of America." We see that one of its three parts embraces the largest generalities of Natural Science, under the head of an "Essay on Classification." We see that the other two parts are devoted to the description and delineation of a single order of Reptilia,—the Testudinata, or "Turtles."

If Mr. Agassiz had intentionally chosen the simplest way of proving that he had naturalized himself in New England, he could not have selected more fortunately than he has done by adopting our word Turtle to cover all the Testudinates. To an Englishman a turtle is a sea-monster, that for a brief space lies on his back and fights the air with his useless paddles in the bow-window of a provision-shop, bound eventually to Guildhall, there to feed Gog and Magog, or his worshippers, known as aldermen. For him a land-testudinate is a tortoise. When his poets and romancers speak of turtles, again, they commonly mean turtle-doves.

"Not half so swift the sailing falcon flies
That drives a turtle through the liquid skies."

The only flight of a testudinate which we remember is that downward one of the unfortunate tortoise that cracked the bald crown of Aeschylus. But turtle, as embracing all chelonians, or, as liberal shepherds call it, "turkle," is unquestionably Cisatlantic. The distinguished naturalist has made himself an American citizen by adopting our own expression, and should have the freedom of all our cities presented to him in the shell of a box-TURTLE.

It is singular to recall the honors which have been bestowed on the testudinates from all antiquity. It was the sun-dried and sinew-strung shell of a tortoise that suggested the lyre to Mercury, as he walked by the shore of Nilus. It was on the back of a tortoise that the Indian sage placed his elephant which upheld the world. Under the testudo the Roman legions swarmed into the walled cities of the orbis terrarum. And in that wise old fable which childhood learns, and age too often remembers, sorrowing, it was the tortoise that won the race against the swiftest of the smaller tribes, his competitor.

And here once more we have his shell strung with vibrating thoughts that repeat the harmonies of nature. Once more his broad back stoops to the weighty problems which the planet proposes to its children. Once more the great cities are stormed—by science—beneath his coat of mail. Once more he has run the race, not against the hare only, but the whole animal kingdom, and won it, and with it the new fame which awaits him, as he leads in the long array of his fellows that are to come up, one by one, in these enduring records. And so we turn the leaf, and come to the DEDICATION.