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210 this age of inquiry and experiment, without any attention to the wonders every day produced by the pokers of magnetism and the wheels of electricity. At least, I may be allowed to hope that, since nothing is more contrary to moral excellence than envy, you will not refuse to promote the happiness of others, merely because you cannot partake of their enjoyments.

In confidence, therefore, that your ignorance has not made you an enemy to knowledge, I offer you the honour of introducing to the notice of the publick, an adept, who having long laboured for the benefit of mankind, is not willing, like too many of his predecessors, to conceal his secrets in the grave.

Many have signalized themselves by melting their estates in crucibles. I was born to no fortune, and therefore had only my mind and body to devote to knowledge, and the gratitude of posterity will attest, that neither mind nor body have been spared. I have sat whole weeks without sleep by the side of an athanor, to watch the moment of projection; I have made the first experiment in nineteen diving engines of new construction; I have fallen eleven times speechless under the shock of electricity; I have twice dislocated my limbs, and once fractured my skull, in essaying to fly[l]; and four times endangered my life by submitting to the transfusion of blood.

In the first period of my studies, I exerted the powers of my body more than those of my mind, and was not without hopes that fame might be purchased by a few broken bones without the toil of thinking; but having been shattered by some violent experiments, and constrained to