Unlimited Quote Collections
Organize your favorite quotes without limits. Create themed collections for every occasion with Premium.
Everything in nature completes its action through its own force and species alone... as, for example, fire by its own force dries and consumes and do… - Roger Bacon
" "Everything in nature completes its action through its own force and species alone... as, for example, fire by its own force dries and consumes and does many things. Therefore vision must perform the act of seeing by its own force. But the act of seeing is the perception of a visible object at a distance, and therefore vision perceives what is visible by its own force multiplied to the object. Moreover, the species of the things of world are not fitted by nature to effect the complete act of vision at once, because of its nobleness. Hence these must be aided by the species of the eye, which travels in the locality of the visual pyramid, and changes the medium and ennobles it, and renders it analogous to vision, and so prepares the passage of the species itself of the visible object... Concerning the multiplication of this species, moreover, we are to understand that it lies in the same place as the species of the thing seen, between the sight and the thing seen, and takes place along the pyramid whose vertex is in the eye and base in the thing seen. And as the species of an object in the same medium travels in a straight path and is refracted in different ways when it meets a medium of another transparency, and is reflected when it meets the obstacles of a dense body; so is it also true of the species of vision that it travels altogether along the path of the species itself of the visible object.
English
Collect this quote
About Roger Bacon
Roger Bacon (c. 1219/20 – c. 1292), also known as Doctor Mirabilis (Latin: "wonderful teacher"), was an English theologian, philosopher and Franciscan friar. An English philosopher who placed considerable emphasis on empiricism, he was one of the earliest European advocates of the modern scientific method. Later studies have emphasized his reliance on occult and alchemical traditions. All his theoretical writings were originally in Latin.
Also Known As
Pen Names:
Doctor Mirabilis
Alternative Names:
Rogerus
•
Rogerus Bacon
•
Rogerus Baconus
•
Frater Rogerus
•
Rogerus Baconis
•
Rogerius Baconis
•
Ruggiero Bacone
•
Rogerus Bachon
•
Rogerius Bacconis
•
Ruggero Bacone
•
Roger Bacco
•
Rogerius Baco
•
Roger
•
Roger Bachon
•
Roger Bacho
•
Rogerius Bacco
•
Roger Baco
•
Rogeri Baconis
•
Admirable Doctor
Related quotes. More quotes will automatically load as you scroll down, or you can use the load more buttons.
Additional quotes by Roger Bacon
Argument is conclusive... but... it does not remove doubt, so that the mind may never rest in the sure knowledge of the truth, unless it finds it by the method of experiment. For if any man who never saw fire proved by satisfactory arguments that fire burns, his hearer's mind would never be satisfied, nor would he avoid the fire until he put his hand in it that he might learn by experiment what argument taught.
[H]aec vocatur scientia experimentalis, quae negligit argumenta, quoniam non certificant, quantumcunque sint fortia, nisi simul adsit experientia conclusionis. Et ideo haec docet experiri conclusiones nobiles omnium scientiarum, quae in aliis scientiis aut probantur per argumenta, aut investigantur per experientias naturales et imperfectas...
PREMIUM FEATURE
Advanced Search Filters
Filter search results by source, date, and more with our premium search tools.
I use the example of the rainbow and of the phenomena connected with it, of which sort are the circle around the sun and the stars, likewise the rod lying at the side of the sun or of a star which appears to the eye in a straight line... called the rod by Seneca, and the circle is called the corona, which often has the colors of the rainbow. But neither Aristotle nor Avicenna, in their Natural Histories, has given us knowledge of things of this sort, nor has Seneca, who composed a special book on them. But Experimental Science makes certain of them. [The experimenter] considers rowers and he finds the same colors in the falling drops dripping from the raised oars when the solar rays penetrate drops of this sort. It is the same with waters falling from the wheels of a mill; and when a man sees the drops of dew in summer of a morning lying on the grass in the meadow or the field, he will see the colors. And in the same way when it rains, if he stands in a shady place and if the rays beyond it pass through dripping moisture, then the colors will appear in the shadow nearby; and very frequently of a night colors appear around the wax candle. Moreover, if a man in summer, when he rises from sleep and while his eyes are yet only partly opened, looks suddenly toward an aperture through which a ray of the sun enters, he will see colors. And if, while seated beyond the sun, he extend his hat before his eyes, he will see colors; and in the same way if he closes his eye, the same thing happens under the shade of the eyebrow; and again, the same phenomenon occurs through a glass vessel filled with water, placed in the rays of the sun. Or similarly if any one holding water in his mouth sprinkles it vigorously into the rays and stands to the side of the rays; and if rays in the proper position pass through an oil lamp hanging in the air, so that the light falls on the surface of the oil, colors will be produced. And so in an infinite number of ways, as well natural as artificial, colors of this sort appear, as the careful experimenter is able to discover.
Loading...