IV.—On the Convection of Heat by Air Currents

^{page 39 note *} “Scala graduum caloris et frigoris,” Phil. Trans., April 1701, vol. xxii. p. 824. Also in Newton's Works, Horsley's edition, 1782, vol. iv.

^{page 39 note †} Ann. de Ch. et de Physique, 1817, vi. pp. 259–303.

^{page 40 note *} Theorie Analytique de la Chaleur, ch. i. sect. ii.

^{page 40 note †} Leslie, , An Experimental Enquiry into the Nature and Propagation of Heat, London, 1804, p. 279.

^{page 40 note ‡} See Porter, , Phil. Mag., xxxix. 268–279.

^{page 41 note *} It is very desirable that some coating be found, similar to that of soot or lampblack, which will note readily rub off, or be affected by steam or exposure to a high temperature.

^{page 43 note *} Proc. Roy. Soc., xxxii. 465.

^{page 46 note *} The experiments described in this paper were conducted in a underground cellar, in which the diurnal variation of temperature is scarcely noticeable.