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valuable step of reducing to a system the method of investigation adopted by those eminent men, generalizing it, and extending its application to all matters of contingent truth, exploding the errors, the absurd dogmas, and fantastic subtleties of the ancient schools, above all, confining the subject of our inquiry, and the manner of conducting it, within the limits which our faculties prescribe. Nor is this great law of gradual progress confined to the physical sciences; in the moral it equally governs. Before the foundations of political economy were laid by Hume and Smith, a great step had been made by the French philosophers, disciples of Quesnai; but a nearer approach to sound principles had signalized the labours of Gournay, and those labours had been shared and his doctrines patronized by Turgôt, when chief minister.

Again, in constitutional policy, see by what slow degrees, from its first rude elements, the attendance of feudal tenants at their lord's court, and the summons of burghers, to grant supplies of money, the great discovery of modern times in the science of practical politics has been effected, the representative scheme which enables States of any extent to enjoy popular government, and allows mixed monarchy to be established, combining freedom with order-a plan pronounced by the statesmen and writers of antiquity to be of hardly possible formation, and wholly impossible continuance. The globe itself, as well as the science of its inhabitants, has been explored according to the law which forbids a sudden and rapid leaping forward, and decrees that each successive step, prepared by the last, shall facilitate the next. Even Columbus followed several successful discoverers on a smaller scale, and is by some believed to have had, unknown to him, a predecessor in the great exploit by which he pierced the night of ages, and unfolded a new world to the eyes of the old. The arts afford no exception to the general law. Demos

valuable step of reducing to a system the method of investigation adopted by those eminent men, genera lizing it, and extending its application to all matters of contingent truth, exploding the errors, the absurd dogmas, and fantastic subtleties of the ancient schools, Above all, confining the subject of our inquiry, and he manner of conducting it, within the limits which our faculties prescribe. Nor is this great law of gradual progress confined to the physical sciences; the moral it equally governs. Before the foundaions of political economy were laid by Hume and mith, a great step had been made by the French hilosophers, disciples of Quesnai; but a nearer aproach to sound principles had signalized the labours Gournay, and those labours had been shared and s doctrines patronized by Turgôt, when chief

inister.

Again, in constitutional policy, see by what slow grees, from its first rude elements, the attendance feudal tenants at their lord's court, and the sumons of burghers, to grant supplies of money, the eat discovery of modern times in the science of actical politics has been effected, the representative heme which enables States of any extent to enjoy pular government, and allows mixed monarchy to established, combining freedom with order-a En pronounced by the statesmen and writers of anuity to be of hardly possible formation, and wholly possible continuance. The globe itself, as well as science of its inhabitants, has been explored ac ding to the law which forbids a sudden and rapid ping forward, and decrees that each successive P, prepared by the last, shall facilitate the next. en Columbus followed several successful discoers on a smaller scale, and is by some believed to e had, unknown to him, a predecessor in the great loit by which he pierced the night of ided a new world to the eyes of the old. The afford no exception to the general law. Demos

ages,

and

thenes had eminent forerunners, Pericles the last of
them. Homer must have had predecessors of great
merit, though doubtless as far surpassed by him as
Fra Bartolomeo and Pietro Perugino were by Michael
Angelo and Raphael. Dante owed much to Virgil;
be allowed to have owed, through his Latin
Mentor, not a little to the old Grecian; and Milton
had both the orators and poets of the ancient world
for his predecessors and his masters. The art of war
itself is no exception to the rule.
The plan of
bringing

he

may

point had been tried occasionally before Frederick II. an overpowering force to bear on a given reduced it to a system; and the Wellingtons and

their strategy, as it had also been previously the

mainspring of our naval tactics.

It has oftentimes

been held that the invention of logarithms stands alone in the history of science, as having been preceded by no step leading towards the discovery. There is, however, great inaccuracy in this statement, for not only was the doctrine of infinitesimals familiar to its illustrious author, and the relation of geometrical to arithemetical series well known, but he had himself struck out several methods of great ingenuity and utility

were by the consummation which has immortalized methods that are now forgotten, eclipsed as they

his name.

ceded as he was by Worcester and Newcomen, but So the inventive powers of Watt, pre

far more

exercised on some admirable contrivances,
materially by Causs and Papin, had been

now for

gotten, before he made the step which created the steam-engine anew-not only the parallel motion, possibly a corollary to the proposition on circular mo

tion in the Principia, but the separate condensation, and above all, the governor, perhaps the most exquisite of mechanical inventions: and now we have those here present who apply the like principle to the diffusion of knowledge, aware, as they must be, that

PREFACE.

THE present is the fourth volume of the "POPULAR LECTURER," new series. It contains 30 lectures, extending to 384 pages, the average cost being one penny each. The subjects treated comprise Education, Natural History, Language, Mechanics, Industry, Cotton, Pictures, Travels, Biography, Mining, Science, Poetry, Music, &c.

Amongst the authors of these lectures will be found the names of Lord Brougham; the Rev. Dr. Hook; Dr. Latham; the Dean of Carlisle ; Thomas Bazley, Esq., M.P.; Leo. H. Grindon, Esq.; R. W. Emerson, Esq.; the Rev. Marmaduke Miller; George Dawson, Esq., M.A.; His Royal Highness the Prince Consort; E. W. Binney, Esq., F.R.S., F.G.S.; the Right Hon. Sir James Stephen; and other well-known names in literature and science.

The volume will be found to contain a large fund of valuable and interesting information, of the kind most serviceable to students, and the members of educational institutions generally. A "revival" is taking place in the art of lecturing, and our readers shall have the benefit of it. We would strongly urge young men who listen to lectures to study shorthand. Phonography is the system in which these lectures have been reported by

THE EDITOR.

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