Through that of the art of printing, the fruits of observation and reflection, of discoveries and inventions, with all the accumulated stores of previously acquired knowledge, are preserved and widely diffused.  The application of gunpowder to the art of war has forever settled the long conflict for ascendency between civilization and barbarism, in favor of the former, and thereby guaranteed that, whatever knowledge is now accumulated, or may hereafter be added, shall never again be lost.

The numerous discoveries and inventions, chemical and mechanical, and the application of steam to machinery, have increased many fold the productive powers of labor and capital, and have thereby greatly increased the number who may devote themselves to study and improvement, and the amount of means necessary for commercial exchanges, especially between the more and the less advanced and civilized portions of the globe, to the great advantage of both, but particularly of the latter.

The application of steam to the purposes of travel and transportation, by land and water, has vastly increased the facility, cheapness, and rapidity of both:  diffusing, with them, information and intelligence almost as quickly and as freely as if borne by the winds; while the electrical wires outstrip them in velocity, rivaling in rapidity even thought itself.

The joint effect of all this has been a great increase and diffusion of knowledge; and, with this, an impulse to progress and civilization heretofore unexampled in the history of the world, accompanied by a mental energy and activity unprecedented.

To all these causes, public opinion, and its organ, the press, owe their origin and great influence.  Already they have attained a force in the more civilized portions of the globe sufficient to be felt by all governments, even the most absolute and despotic.  But, as great as they now are, they have, as yet, attained nothing like their maximum force.  It is probable that not one of the causes which have contributed to their formation and influence, has yet produced its full effect; while several of the most powerful have just begun to operate; and many others, probably of equal or even greater force, yet remain to be brought to light.

When the causes now in operation have produced their full effect, and inventions and discoveries shall have been exhausted—­if that may ever be—­they will give a force to public opinion, and cause changes, political and social, difficult to be anticipated.  What will be their final bearing, time only can decide with any certainty.

That they will, however, greatly improve the condition of man ultimately, it would be impious to doubt; it would be to suppose that the all-wise and beneficent Being, the Creator of all, had so constituted man as that the employment of the high intellectual faculties with which He has been pleased to endow him, in order that he might develop the laws that control the great agents of the material world, and make them subservient to his use, would prove to him the cause of permanent evil, and not of permanent good.