Date: 1783

The human body is like a barometer: "If the external air can affect the motions of so heavy a substance as mercury, in the tube of the barometer; we need no wonder, that it should affect those finer fluids, that circulate through the human body."

— Beattie, James (1735-1803)

Date: 1783

"But it is urged, that in sleep, the soul is passive, and haunted by visions, which she would gladly get rid of if she could"

— Beattie, James (1735-1803)

Date: April, 1783

If human souls are of an essence pure, / How fix ideas in them to endure? / And if material, canst not thou, Monro, / The little cells of our ideas show?"

— Boswell, James (1740-1795)

Date: April, 1783

"He gives a curious system of the instrument of Memory, which he says is the last or inner ventricle of the brain, whereas the first or outer ventricles are the instruments of perception or thought. He affirms that, according as you hurt one or other of thole instruments, you destroy either of th...

— Boswell, James (1740-1795)

Date: April, 1783

"When we talk of a storehouse of our ideas, we are only forming an imagination of something similar to an enclosed portion of space in which material objects are reposited. But who ever actually saw this storehouse, or can have any clear perception of it when he endeavours by thinking closely to ...

— Boswell, James (1740-1795)

Date: April, 1783

"I asked him, if he could give me any notion of the situation of our ideas which we have totally forgotten at the time, yet shall afterwards recollect. He paused, meditated a little, and acknowledged his ignorance in the spirit of a philosophical poet, by repeating as a very happy allusion a pass...

— Boswell, James (1740-1795)

Date: April, 1783

"As, however, his penetration could not but see that all this is absolutely incompatible with a spiritual substance which mind is, he, immediately without any interruption or preparation whatever, proceeds very quietly, though most effectually, to contradict what he has been assuming, and to anni...

— Boswell, James (1740-1795)

Date: April, 1783

"And yet in my own mind I am not sure but there may be such, an analogy between the nature of spirit and that of matter, as to admit of a receptacle of ideas."

— Boswell, James (1740-1795)

Date: April, 1783

"And we must be content to rest upon the surface without straining to pierce into causes which are hidden from us, and which have hitherto mocked the attempts of impatient philosophers. We should resolve to wait till a longer fathom line is granted us, and then we shall be able to sound depths wh...

— Boswell, James (1740-1795)

Date: April, 1783

"If impressions are made upon some substance in the mind, may not forgetfulness of them be only that the perceptive faculty of the soul is turned to other objects, while these still remain ready to be perceived whenever the 'mind's eye,' glances upon them?"

— Boswell, James (1740-1795)