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SERVITUDES, NATURAL, civil law. Those servitudes which arise in consequence of the nature of the soil.
     2. By law the inferior heritages, are submitted in relation to the natural flow of waters, and the like, to the superior. An inferior field is, therefore, subject to the injury or prejudice which the situation of the ground, in its natural state, way cause it.

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about extrapolating beyond natural experiments, when Klausner urges
To sum up, this work answers the broad question "do natural experiments provide valid estimates in Political Science?"
Here again was a critical role for the natural experiment. In Darwin's case, his interpretation of what happens to finches when they are isolated from each other on different islands of the Galapagos, is one of the best known natural experiments in all of science.
The results of simulations obtained using numerical finite element models match the findings of natural experiments. Making adjustments in describing materials and technological connections is sufficient for a description of damages to deformation zone elements.
Another problem with relying on natural experiments is that comparisons of their results with longstanding practices rarely present sharp contrasts.
Deliberate experiments are substitutes for natural experiments. Hence, the incidence of natural experiments arising from exogenous shocks influences the value of intentional experiments.
Originally, we had in mind to consider only randomised or natural experiments and quasi-experiments where important intervening variables had been controlled for that went beyond what one usually finds in criminal records (such as number and kind of previous convictions and offences, plus age and gender); in particular, we thought that a certain number of studies might have considered also education, employment record and drug or alcohol abuse history.
Instead, quasi-experiments and natural experiments can be used to test ICT products.
Seven were randomized controlled trials (RCTs) and 10 controlled clinical trials (CCTs) or natural experiments. Twenty-two studies went on to further analysis based on a set of criteria.
Historical evidence from "natural experiments," such as the 1770 Saint-Domingue epidemic, should be considered in public health efforts to prevent disease re-emergence and increase awareness about bioterrorism potential.

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