Humboldt said: "It is indeed a brilliant effort, worthy of the human mind, to comprise in one organic whole, the entire science of nature, from the laws of gravity to the formative impulse in animated bodies;" but the preoccupation of his vast mind, and the hold of pre-existing ideas, offered difficulties to the solution of the problem. But, note the approximation of his ideas to those herein expressed, he said: "The sun, as the main source of light and heat, must be able to call forth and animate magnetic forces on our planet." Unfortunately, however, he continues thus: "and more especially in the gaseous strata of our atmosphere."
Faraday, perhaps the most distinguished man, in the whole of his own field, which the world has ever produced, recognizing the power of this great obstacle to true advancement (i. e., preconceived and pre-existing ideas), once said: "When such a one as myself gets out of the way, then new conditions, new men, new views, new opportunities, may allow of the development of other lines of active operation than those heretofore in service." He believed in the existence of one great universal principle, from which gravity, heat, light, electricity, magnetism, even life itself might come. He spent many of his latest years in efforts to solve this great problem, and on his failure he asked: "Is it all a dream?" He never, however, wavered in his faith, and his last efforts were directed to that end.
With prophetic vision, almost amounting to prescience, he, in speaking of magnetism, said: "When we remember that the earth itself is a magnet, pervaded in every part by this mighty power, universal and strong as gravity itself, we cannot doubt that it is exerting an appointed and essential influence over every particle of matter, and in every place where it is present.
"What its great purpose is, seems to be looming up in the distance before us:—the clouds which obscure our mental sight are daily thinning, and I cannot doubt that a glorious discovery in natural knowledge and in the wisdom and power of God in the creation is awaiting our age."
Thus did those great philosophers so nearly attain to the goal of their highest earthly aspirations, and only failed in the consummation by reason of clinging to the existing opinions of their age.
APPENDIX.
1. ([Page 22.]) "Bruno, about the close of the last century, guessed the fundamental fact of the Nebular Hypothesis, and Kant reasoned out its foundation idea, and Laplace developed it."—Correlation and Conservation of Forces.
We have learned to recognize on how very doubtful a basis many of the received axioms of physical science are founded. This hypothesis has been received with much unanimity and has firmly held its sway. Yet, "Bruno guessed the fundamental fact," and this figment of the imagination has, for nearly a century, controlled the scientific mind. Its paralyzing influences have affected other departments of physical science, and true progress has been obstructed. The attempt to describe minutely how the spheres were formed millions of years ago is but presumption.