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This is also the result reached by Professor Poynting in experiments regarding the possible action of temperature on the weight of a body; and if this be really so, we may reassure ourselves, and from the point of view of practical application may continue to look upon matter as indestructible.
The poore people seeing vs goe away againe, came rowing after vs into the Sea, the waues being somewhat loftie. We truckt with them for a few skinnes and dartes, and gaue them beads, nailes, pinnes, needles and cardes, they poynting to the shore, as though they would shew vs some great friendship: but we little regarding their curtesie, gaue them the gentle farewell, and so departed.
Schröter's final result in 1811 was 23h. 21m. 7·977s. Monat. Not., vol. lvii., p. 402; Astr. Phys. Roy. Astr. Nach., No. 2,021; Am. Spettr. Ital., Dicembre, 1882; Am. Ass., 1873, p. 407. Nach., No. 2,809; f. Nach., No. 3,097; Phil. Trans., vol. clxxxvi., A., p. 469; Proc. Roy. Geol. Soc., vol. iii. Mag., vol. xxviii. Wien, Bd. lxiv.; quoted by Poynting. Cf. The Moon, by T. Gwyn Elger, p. 20.
Professor Poynting believes that its temperature is below the freezing-point of water all over the globe; many others, if not the majority of observers, hold that the white cap we see at its poles is a mass of ice and snow, or at least a thick coat of hoar-frost, and that it melts at the edges as the springtime of Mars comes round. In regard to its famous canals we are no nearer agreement.
I think it is impossible to raise the temperature of Mars to anything like the value obtained by Professor Lowell, unless we assume some quality in his atmosphere entirely different from any found in our own atmosphere." J.H. POYNTING. October 19, 1907.
M. Wilsing's of 5·58, obtained at Potsdam in 1889, nearly agreed with it; while Professor Poynting, by means of a common balance, arrived at a terrestrial mean density of 5·49. Professor Boys next entered the field with an exquisite apparatus, in which a quartz fibre performed the functions of a torsion-rod; and the figure 5·53 determined by him, and exactly confirmed by Dr.
Other methods have been employed in late years by other experimenters, such as the method of Baron Eötvös, founded on the use of a torsion lever, the method of the ordinary balance, used especially by Professors Richarz and Krigar-Menzel and also by Professor Poynting, and the method of M. Wilsing, who uses a balance with a vertical beam.
This form of 'perpetual motion' might be equally obtainable if Dr. Preston's theory of an ether as the cause of gravity be true. Indeed, Professor Poynting is now engaged in searching for such a crystal, which, if discovered, will upset the second law of thermo-dynamics.
Professor Poynting, and after him Professor Planck and Professor Ostwald, supposed this to be the case, but more recently M. Tamman has shown that such a point does not exist, and that the region of stability of the crystallized state is limited on all sides.
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