A difficulty exists in the provision of officers for this great army of pupils. They cannot always be raised from the ranks. The thoroughness of a teacher's knowledge is not acquired by the requisite proportion. Normal schools demand more and more attention. But here we arrive at a field of detail that would lead us far beyond the limit of these articles. We pass naturally from the subject of education to what is, in the narrower but most generally accepted sense of the word—mental training– its leading object of pursuit.
If, in the broader and truer meaning of education—that which assumes the impalpable part of man to be something more than a sponge for facts– the slender phalanx of the men who know will ever remain, proportionally, a small band, it is at least certain that in acquaintance with natural phenomena and their relations the masses of the nineteenth century stand out from their forefathers as eminent philosophers. Our age may be almost said to have created rather than extended science, so mighty is the bulk of what it has added by the side of what it found.
In mathematics, the branch which most nearly approaches pure reason, least advance has been made. There was least room for it. Newton, when, at quite a mature period of his career, Euclid was first brought to his attention, laid the book down after a cursory glance with the remark that it was only fit for children, its propositions being self-evident. Yet to those truisms Newton added very little. His work lay in their development and application. Laplace and Biot belong to our own day; but their task, too, consisted in the employment of old rules. The most effective tools of the mathematician are framed from the Arab algebra and Napier's logarithms. The science itself without application is, like logic, a soul without a body.
The field most fruitful under its application is that of astronomy. Here, progress has been great. A measuring-rod has been provided for the depths of space by the ascertainment of the sun's distance within a three-hundredth part of that body's diameter. The existence of a cosmic ether, a resisting medium, has been established, and its retarding influence calculated. Many of the nebulae have been reduced, and others proved to be in a gaseous condition, like comets. The latter bodies have been chained down to regular orbits, followed far beyond those of the old planets, and brought into genealogical relations with these through the links of bolides and asteroids. The family circle of planets proper has been immensely increased, a new visitant to the central fire appearing every few years or even months. Newton connected the most distant points of the universe by the one principle of gravitation: the spectroscope unites them by identity of structure and composition. Improved instruments have detected the parallax of a number of the fixed stars, and traced motion in both solar and stellar systems as units. Coming homeward from the distant heavens, the advances of astronomy diminish as we near what may be called the old planets and our pale companion the moon. The existence of a lunar atmosphere and the habitability of Mars are still debated; with, we believe, the odds against both. But the star-gazers make their craft useful in a novel way when it reaches the earth. Upon the precession of the equinoxes they erect a fabric of retrograde chronology, and set a clock to geologic time. Here Sir Isaac is brought to grief. His excursions beyond the Deluge are proved blind guides. He misleads us among the ages as sadly as Archbishop Usher. The profoundest of laymen and the most learned of clerics are equally at sea in locating creation. That successive phases of animate existence were rising and fading with the oscillations of the earth's inclination to its orbit never occurred to him to whom "all was light." To probe the stars was to him a simpler process than to anatomize the globe upon which he stood.
This is the less remarkable when we reflect what a hard fight geology has had. A generation after Newton's death fossils were referred for their origin to a certain "plastic power" in Nature—mere idle whittlings of bone that had never known an outfit of flesh and blood. Then came a long and motley procession of cosmogonies, every speculator, from John Wesley down to Pye Smith, insisting warmly on what seemed good in his own eyes. The last stand was made on the antiquity of man, and it is only a dozen years since the ablest of British—perhaps since Cuvier of modern—geologists, Sir Charles Lyell, yielded to the preponderance of evidence, and confessed that the era of man's appearance on earth had been made too recent. A few determined skirmishers still linger behind the line of retreat, like Ney at the bridge of Kowno, and fire some fruitless shots at the advancing enemy. This is well. Tribulation and opposition are good for any creed, scientific or other. It weeds out the weak ones and strengthens those that are to stand.
The mapping out of extinct faunas and floras and assigning pedigree to existing species are by no means the whole province of geologists. Productive industry owes to them a vast saving of time and cost in searching for useful minerals. They distinguish the same strata in widely separated districts by means of the characteristic fossils, and are thus enabled to guide the miner. A geological survey of its territory is one of the first cares of an enlightened government, and a geologist is the one scientific official the leading States of the Union agree in maintaining. The science has moved forward steadily from its original office of studying buried deposits and classifying extinct organisms, until the hard and fast line between fossil and recent has disappeared, the continuous action of ordinary causes in past and present been established, and an unbroken domain assigned to the laws of the visible creation. Deep-sea soundings have extended inquiry, slight enough as yet, to that immensely preponderant portion of the globe's crust that is covered by water. Penetrating the ocean is like penetrating the rocks, inasmuch as it introduces us to some of the same primal forms of life; but it presents them in an active and sentient state. Neptune's ravished secrets vindicate the Neptunists, while Pluto is relegated to the abode assigned him by classic myths, where he and his comrade, Vulcan, keep their furnaces alight and project their slag and smoke through many a roaring chimney.
Upon (as beneath) the deep, science is erecting for itself new homes. It tracks the wandering wind, and moves at ease, calmly as a surveyor with chain and compass, through the eddies of the cyclone. It maps for the sailor the currents, aerial and subaqueous, of each spot on the unmarked main, and sends him warning far ahead of the tempest. It divides with the thermometer the mass of brine into horizontal zones, and assigns to each its special population.
A hundred years ago, only the surface of the land was studied, and but a small part of that. All beneath its surface was a mystery, and the lore of the sea was untouched. Now, knowledge has penetrated to the central fire, and of the sea it can be no longer said that man's "control stops with its shores." The pathway of his messenger from continent to continent he has laid deep in its chalky ooze, while over it silt silently, flake by flake, as they have been falling since æons before his creation, the induviæ of the earliest creatures.
And this his messenger at the bottom of the sea is back in its old home. First hidden in the electron cast up by the waves of the Baltic, it was left there, uncomprehended and barren, till our century. During all that time it was calling from the clouds to man's dazzled eye and deafened ear. It pervaded the air he breathed, the ground he trod and the frame which constituted him. It bore his will from brain to hand, and guarded his life, through the (so-called) spontaneously acting muscles of the thorax, during the half or third of his life during which his will slumbered. At length its call was hearkened to intelligently. Franklin made it articulate. Its twin Champollions came in Volta and Galvani. Its few first translated words have, under a host of elucidators, swelled to volumes. They link into one language the dialects of light, motion and heat. The indurated turpentine of the Pomeranian beach speaks the tongue of the farthest star.
The sciences, like the nations and like bees, as they grow too large for their hive are perpetually swarming and colonizing. Not that colonization is followed, as in the case of the similitude, by independence. Their mutual bonds become closer and closer. But convenience and (so to speak) comfort require the nominal separation. So electricity sets up for itself; and chemistry, the metropolis, swells into other offshoots. So numerous and so great are these that the old alchemists, unlimited range through the material, immaterial and supernatural as they claimed for their art, would rub their eyes, bleared over blowpipe and alembic, at sight of its present riches.