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66 Spirit. And yet thou dost perceive nothing behind the surface, and hast perceived nothing there?

I. Were I to break through it, I should perceive something.

Spirit. So much therefore thou knowest beforehand. And this infinite divisibility, in which, as thou maintainest, thou canst never arrive at anything absolutely imperceptible, thou hast never carried it out, nor canst thou do so?

I. I cannot carry it out.

Spirit. To a sensation, therefore, which thou hast really had, thou addest in imagination another which thou hast not had?

I. I am sensible only of that which I attribute to the surface; I am not sensible of what lies behind it, and yet I assume the existence of something there which might be perceived. Yes, I must admit what thou sayest.

Spirit. And the actual sensation is in part found to correspond with what thou hast thus pre-supposed?

I. When I break through the surface of a body, I do indeed find beneath it something perceptible, as I pre-supposed. Yes, I must admit this also.

Spirit. Partly, however, thou hast maintained that there is something beyond sensation, which cannot become apparent to any actual perception.

I. I maintain, that were I to divide a corporeal mass to infinity, I could never come to any part which is in itself imperceptible; although I admit that I can never make the experiment,—can never practically carry out the division of a corporeal mass to infinity. Yes, I must agree with thee in this also.

Spirit. Thus there is nothing remaining of the