1. 1879. Laboratory Note-book, Dec. 12
2. 1880. Math. Soc. Proc., Feb. 12
3. 1850. Camb. Phil. Trans., “On the effect of internal friction of fluids on the motion of pendulums,” § 5. See also Helmholtz, Wied.Ann.Bd. vii. p. 337 (1879), or Reprint, vol. i. p. 891.
4. 1880. Laboratory Note-book, Jan. 20Prof. Osborne Reynolds has availed himself of differences of temperature in order to vary the viscosity, in some recent important observations upon the cognate subject of the flow of water in tubes (Proc. Roy. Soc. March 15, 1883).