Pliny the Younger→Licinius Sura|c. 104 AD|pliny younger
To Licinius Sura. *
I have brought you as a present from my native district a problem which is fully worthy even of your profound learning. A spring rises in the mountain-side; it flows down a rocky course, and is caught in a little artificial banqueting house. After the water has been retained there for a time it falls into the Larian lake. There is a wonderful phenomenon connected with it, for thrice every day it rises and falls with fixed regularity of volume. Close by it you may recline and take a meal, and drink from the spring itself, for the water is very cool, and meanwhile it ebbs and flows at regular and stated intervals. If you place a ring or anything else on a dry spot by the edge, the water gradually rises to it and at last covers it, and then just as gradually recedes and leaves it bare; while if you watch it for any length of time, you may see both processes twice or thrice repeated. Is there any unseen air which first distends and then tightens the orifice and mouth of the spring, resisting its onset and yielding at its withdrawal? We observe something of this sort in jars and other similar vessels which have not a direct and free opening, for these, when held either perpendicularly or aslant, pour out their contents with a sort of gulp, as though there were some obstruction to a free passage. Or is this spring like the ocean, and is its volume enlarged and lessened alternately by the same laws that govern the ebb and flow of the tide? Or again, just as rivers on their way to the sea are driven back on themselves by contrary winds and the opposing tide, is there anything that can drive back the outflow of this spring? Or is there some latent reservoir which diminishes and retards the flow while it is gradually collecting the water that has been drained off, and increases and quickens the flow when the process of collection is complete? Or is there some curiously hidden and unseen balance which, when emptied, raises and thrusts forth the spring, and, when filled, checks and stifles its flow? Please investigate the causes which bring about this wonderful result, for you have the ability to do so; it is more than enough for me if I have described the phenomenon with accuracy. ** Farewell.
[Note: The famous general, and friend of Trajan.
]
[Note: This intermittent spring is also mentioned by Pliny the Elder, HN ii.(106)232.
]
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L To Licinius Sura. *
I have brought you as a present from my native district a problem which is fully worthy even of your profound learning. A spring rises in the mountain-side; it flows down a rocky course, and is caught in a little artificial banqueting house. After the water has been retained there for a time it falls into the Larian lake. There is a wonderful phenomenon connected with it, for thrice every day it rises and falls with fixed regularity of volume. Close by it you may recline and take a meal, and drink from the spring itself, for the water is very cool, and meanwhile it ebbs and flows at regular and stated intervals. If you place a ring or anything else on a dry spot by the edge, the water gradually rises to it and at last covers it, and then just as gradually recedes and leaves it bare; while if you watch it for any length of time, you may see both processes twice or thrice repeated. Is there any unseen air which first distends and then tightens the orifice and mouth of the spring, resisting its onset and yielding at its withdrawal? We observe something of this sort in jars and other similar vessels which have not a direct and free opening, for these, when held either perpendicularly or aslant, pour out their contents with a sort of gulp, as though there were some obstruction to a free passage. Or is this spring like the ocean, and is its volume enlarged and lessened alternately by the same laws that govern the ebb and flow of the tide? Or again, just as rivers on their way to the sea are driven back on themselves by contrary winds and the opposing tide, is there anything that can drive back the outflow of this spring? Or is there some latent reservoir which diminishes and retards the flow while it is gradually collecting the water that has been drained off, and increases and quickens the flow when the process of collection is complete? Or is there some curiously hidden and unseen balance which, when emptied, raises and thrusts forth the spring, and, when filled, checks and stifles its flow? Please investigate the causes which bring about this wonderful result, for you have the ability to do so; it is more than enough for me if I have described the phenomenon with accuracy. ** Farewell.
(*) The famous general, and friend of Trajan.
(**) This intermittent spring is also mentioned by Pliny the Elder, HN ii.(106)232.
Book 5 →
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◆
To Licinius Sura. *
I have brought you as a present from my native district a problem which is fully worthy even of your profound learning. A spring rises in the mountain-side; it flows down a rocky course, and is caught in a little artificial banqueting house. After the water has been retained there for a time it falls into the Larian lake. There is a wonderful phenomenon connected with it, for thrice every day it rises and falls with fixed regularity of volume. Close by it you may recline and take a meal, and drink from the spring itself, for the water is very cool, and meanwhile it ebbs and flows at regular and stated intervals. If you place a ring or anything else on a dry spot by the edge, the water gradually rises to it and at last covers it, and then just as gradually recedes and leaves it bare; while if you watch it for any length of time, you may see both processes twice or thrice repeated. Is there any unseen air which first distends and then tightens the orifice and mouth of the spring, resisting its onset and yielding at its withdrawal? We observe something of this sort in jars and other similar vessels which have not a direct and free opening, for these, when held either perpendicularly or aslant, pour out their contents with a sort of gulp, as though there were some obstruction to a free passage. Or is this spring like the ocean, and is its volume enlarged and lessened alternately by the same laws that govern the ebb and flow of the tide? Or again, just as rivers on their way to the sea are driven back on themselves by contrary winds and the opposing tide, is there anything that can drive back the outflow of this spring? Or is there some latent reservoir which diminishes and retards the flow while it is gradually collecting the water that has been drained off, and increases and quickens the flow when the process of collection is complete? Or is there some curiously hidden and unseen balance which, when emptied, raises and thrusts forth the spring, and, when filled, checks and stifles its flow? Please investigate the causes which bring about this wonderful result, for you have the ability to do so; it is more than enough for me if I have described the phenomenon with accuracy. ** Farewell.
[Note: The famous general, and friend of Trajan.
]
[Note: This intermittent spring is also mentioned by Pliny the Elder, HN ii.(106)232.
]
Book 5 →
Attalus' home page
| 17.10.19
|
Any comments?
Modern English rendering for readability. See the 19th-century translation or original Latin/Greek for scholarly use.