The National Conservation Commission in 1908 estimated the area of the known gas fields of the country at 9000 sq.
This important principle is a direct consequence of the law of the conservation of energy, but was discovered independently by Hess from accurate experiment.
The writings of Joule, which thus occupy the place of honour in the practical 'establishment of the conservation of energy, have been collected into two volumes published by the Physical Society of London.
From the standpoint of the law of conservation of energy, the relation between chemical and thermochemical action bears the following aspect: - A given amount of any substance under given conditions possesses a perfectly definite amount of intrinsic energy, and, no matter what chemical and physical transformations the substance may undergo, it will, when it returns to its original state, possess the original amount of intrinsic energy.
The third general method of calorimetry, that based on the transformation of some other kind of energy into the form of heat, rests on the general principle of the conservation of energy, and on the experimental fact that all other forms of energy are readily and completely convertible into the form of heat.
For the later years of his life his labours may be summed up under the following heads: (1) On the conservation of energy; (2) on hydro-dynamics; (3) on electro-dynamics and theories of electricity; (4) on meteorological physics; (5) on optics; and (6) on the abstract principles of dynamics.
Starting like his predecessors with the indestructibility of matter, Haeckel makes more than they do of the conservation of energy, and merges the persistence of matter and energy in one universal law of substance, which, on the ground that body is subject to eternal transformation, is also' the universal law of evolution.
But it is to the physicists of the 19th century, and especially to Joule, whose experimental results were published in 1843-1849, that we practically owe the most notable advance that has been made in the development of the subject - namely, the establishment of the principle of the conservation of energy (see Energetics and Energy).
In this panpsychistic parallelism he was again like Leibnitz, and he developed his predecessor's view, that the conservation of energy prevents interaction, into the supposition that alongside the physical there is a parallel psychical conservation of energy.
Nevertheless, largely under the influence of the exaggeration of the conservation of energy, many psychologists - Wundt, Paulsen, Riehl, Jodl, Ebbinghaus, Miinsterberg, and in England Lewes, Clifford, Romanes, Stout - have accepted Fechner's psychophysical parallelism, as far at least as men and animals are concerned.