Date: 1775

"To assist the imagination, indeed, but by no means in any consistency with the notion of a nervous fluid, it had been conceived that ideas resembled characters drawn upon a tablet; and the language in which we generally speak of ideas, and their affections, is borrowed from this hypothesis."

— Priestley, Joseph (1733-1804)

Date: 1775

"But neither can any such tablet be found in the brain, nor any style, by which to make the characters upon it; and though some of the more simple phænomena of ideas, as their being more or less deeply impressed, their being retained a longer or or a shorter time, being capable of being revived a...

— Priestley, Joseph (1733-1804)

Date: 1775

"That vibrations corresponding to all the varieties of sensations and ideas that ever take place in any human, mind may take place in the same brain at the same time, can create no difficulty to any person who considers the capacity of the air itself to transmit different vibrations, witho...

— Priestley, Joseph (1733-1804)

Date: 1775

"That vibrations [in the air above London] which are nearly isochronous affect and modify one another, so as to become perfectly so, sufficiently corresponds to the phænomena of ideas, and therefore makes no objection to this doctrine."

— Priestley, Joseph (1733-1804)

Date: 1775

"[T]here may be a farther difference in the constitution of the nerves belonging to the different senses, or there may be so many circumstances that affect or modify their vibrations, that they may be as distinguishable from one another, as different human voices sounding the same note; and proba...

— Priestley, Joseph (1733-1804)

Date: 1775

"For this reason a bow of any kind, that has been bent, does not restore itself to the same form that it had before, but leans a little to the other, in consequence of the spheres of attraction and repulsion belonging to the several particles having been altered by the change of their situation. ...

— Priestley, Joseph (1733-1804)

Date: 1775

"To the mere novice in philosophical investigations, it will appear impossible to reduce all the variety of thinking to so simple and uniform a process; but to the same person it would also appear impossible a priori, that all the varieties of language, as spoken by all the nations in the world, ...

— Priestley, Joseph (1733-1804)

Date: 1775

"Also those phenomena in nature which depend upon gravity, electricity, &c. are no less various and complex; and the more we know of nature, the more particular facts, and particular laws, we are able to reduce to simple and general laws: insomuch that now it does not appear impossible, but that,...

— Priestley, Joseph (1733-1804)

Date: 1775

"In the wildest flights of fancy, it is probable that no single idea occurs to us but such as had a connection with some other impression or idea, previously existing in the mind."

— Priestley, Joseph (1733-1804)

Date: 1775

"To lessen this difficulty a little, let it be considered how exceedingly different, to the eye of the mind, as we may say, are our ideas of sensible things from any thing that could have been conjectured concerning their effect upon us."

— Priestley, Joseph (1733-1804)