[1]. Philosophical Magazine, May 1868; Climate and Time, chap. xxi.; Quarterly Journal of Science, July 1877; Phil. Mag., July 1878; Climate and Cosmology, chaps. xvii. xviii. and xix.
[2]. I prefer to use the term “theory,” with the above understood qualification, viz. a theory in its hypothetical stage.
[3]. Pouillet’s estimate of the rate of solar radiation is here taken.
[4]. Lecture on “The Probable Origin, the Total Amount, and the Possible Duration of the Sun’s Heat,” delivered at the Royal Institution on January 21, 1887, and published in Nature of 27th of the same month. The lecture was afterwards published with considerable additions and alterations in the Proceedings of the Institution vol. xii. It is from this that my quotations are taken.
[5]. Proceedings of the Royal Institution, vol. xii. p. 15.
[6]. Manchester Science Lectures, Fifth Series, p. 31.
[7]. Newcomb’s Astronomy, p. 487, English edition, 1878.
[8]. World Life. p. 27.
[9]. Philosophical Magazine, July 1878; Climate and Cosmology, Chap. xix.
[10]. Proceedings of Royal Society, vol. xliii. p. 117.