What a fool have I been to waste so much time, to spend my days in a study which yields no better fruit, and makes me the laughing stock of the world." Such are the cries of the irritability of genius, and such are often the causes.

The world was in danger of losing a new science, had not LINNAEUS returned to the discoveries which he had forsaken in the madness of the mind! The great SYDENHAM, who, like our HARVEY and our HUNTER, effected a revolution in the science of medicine, and led on alone by the independence of his genius, attacked the most prevailing prejudices, so highly provoked the malignant emulation of his rivals, that a conspiracy was raised against the father of our modern practice to banish him out of the college, as "guilty of medical heresy." JOHN HUNTER was a great discoverer in his own science; but one who well knew him has told us, that few of his contemporaries perceived the ultimate object of his pursuits; and his strong and solitary genius laboured to perfect his designs without the solace of sympathy, without one cheering approbation.

"We bees do not provide honey for ourselves," exclaimed VAN HELMONT, when worn out by the toils of chemistry, and still contemplating, amidst tribulation and persecution, and approaching death, his "Tree of Life," which he imagined he had discovered in the cedar.

But with a sublime melancholy his spirit breaks out; "My mind breathes some unheard-of thing within; though I, as unprofitable for this life, shall be buried!" Such were the mighty but indistinct anticipations of this visionary inventor, the father of modern chemistry! I cannot quit this short record of the fates of the inventors in science, without adverting to another cause of that irritability of genius which is so closely connected with their pursuits.

If we look into the history of theories, we shall be surprised at the vast number which have "not left a rack behind." And do we suppose that the inventors themselves were not at times alarmed by secret doubts of their soundness and stability?
They felt, too often for their repose, that the noble architecture which they had raised might be built on moveable sands, and be found only in the dust of libraries; a cloudy day, or a fit of indigestion, would deprive an inventor of his theory all at once; and as one of them said, "after dinner, all that I have written in the morning appears to me dark, incongruous, nonsensical." At such moments we should find this man of genius in no pleasant mood.