7 ideas
| 8386 | Events are picked out by descriptions, and facts by whole sentences [Crane] |
| 22363 | You have only begun to do real science when you can express it in numbers [Kelvin] |
| 13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
| 8387 | A cause has its effects in virtue of its properties [Crane] |
| 8384 | The regularity theory explains a causal event by other items than the two that are involved [Crane] |
| 20644 | Energy has progressed from a mere formula, to a principle pervading all nature [Kelvin] |
| 20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |