AS in former volumes, the papers here included embrace a wide range of subjects. In Optics, Arts. 149, 150 deal with the reflexion of light at a twin plane of a crystal and, besides revealing unexpected peculiarities respecting polarization, explain some remarkable phenomena observed by Prof. Stokes. Attention may also be called to Art. 185 in which it is shown that the light found by Jamin to be reflected from water at the polarizing angle is to be attributed to a film of grease, and to Art. 157 “On the Limit to Interference when Light is radiated from moving Molecules.”
Several papers treat of capillary questions. In Art. 170 Plateau's “Superficial Viscosity” is traced to greasy contamination of water surfaces. The theory of Surface Forces is expounded in Arts. 176, 186, 193, and attention is called to T. Young's remarkable estimates of molecular magnitudes.
The relative densities of Hydrogen and Oxygen and the composition of Water are the subjects of Arts. 146, 153, 187.
In Acoustics the most important paper is probably that on Bells (Art. 164). The modes of vibration and the corresponding partial tones of a large number of bells are there recorded.
The next volume will bring the Collection down to about the present time and, it is hoped, may be ready in about a year.
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