Imagination, abuse of, by half-civilized nations, 37.
Imbert, his account of Chinese "fire-springs," 158.
Ionian school of natural philosophy, 65, 77, 84, 134.
Isogenic, isoclinical, isodynamic, etc. See Lines.
Jacquemont, Victor, his barometrical observations on the snow-line of the
Himalayas, 32, 231.
Jasper, its formation, 259-261.
Jessen on the gradual rise of the coast of Sweden, 295.
Jorullo, hornitos de, 230.
p 369 Justinian, conjectures on the physical causes of volcanic eruptions, 243.
Kamtz, isobarometric lines, 315; doubts on the greater dryness of mountain air, 334.