92. Elasticity and heat; 93. On the reduction of observations of underground temperatures, with application to Professor Forbes' Edinburgh observations, and the continued Calton Hill series; 94. On the secular cooling of the earth; 95. On the rigidity of the earth, shiftings of the earth's instantaneous axis of rotation, and irregularities of the earth as a timekeeper; 96. Dynamical problems regarding elastic spheroidal shells and spheroids of incompressible liquid; 97. Molecular constitution of matter; 98. Five applications of Fourier's law of diffusion, illustrated by a diagram of curves with absolute numerical values; 99. Motion of a viscous liquid. Equilibrium or motion of an elastic solid. Equilibrium or motion of an ideal substance called for brevity ether. Mechanical representation for magnetic force; 100. On an accidental illustration of the shallowness of a transient electric current in an iron bar; 102. Ether, electricity, and ponderable matter; 103. Professor Tait's experimental results regarding the compressibility of fresh water and sea water at different temperatures. Compressibilities at single temperatures of mercury, of glass, and of water with different proportions of common salt in solution. Being an extract from his contribution to the report on the scientific results of the voyage of H.M.S. Challenger, Vol. II. Physics and chemistry, Part IV; 104. Velocities of waves of different character, and corresponding moduluses in cases of waves due to elasticity, being appendix to Art. XCII sect. 51.