Sentence:  ...here smiting with irresistible force some adamantine rock of gross ignorance or cruel superstition, there shaking with its mighty voice of thunder some dread abyss where lurks the taint of covert vice, or crouches the misshapen form of monstrous irreligion, coursing through gloomy chasms and deep dark ravines, and laying bare to the glorious rays of universal and progressive intelligence the golden sands of philosophic lore and scientific research, ever widening, ever expanding, the while bearing richly-freighted <WSD>argosies</WSD> of accumulated lore onward through years, and ephochs, and cycles — forever onward — to the borad bosom of that illimitable ocean of perfected wisdom which, unsweapt by temporal gale, unruffled by even a transient breeze of earthly misconception or scepticism, placid and profound, sleeps forever beneath the beams of the eternal sun. 
Meaning of the word marked with <WSD> tags:  An abundant supply, boatload.