Zeta Herculis, periodic time, eclipse
of, 398; light, 402. Zinc, seleniate of, effect of tempera- ture on its crystals, 107; sulphate of, its crystals boiled in alcohol, 108.
-, electricity communicated to plates of, 220.
Zodiac, the, signs of, change in their positions, 80. Zone of constant temperature in the atmosphere, 119; laws of storms in the temperate and torrid, 127, 128; of spots on the sun's surface, its breadth, 224; of constant tem-
perature below the earth's crust, 228; comparative unequal distri- bution of land in temperate and torrid, 244; of fixed stars, 385; of stars nearest the sun, 390; ne- bulous, 416; of nebulous patches, 417; of meteoric nebulæ, 423. Zones of instability of planetary orbits,
of temperature in the ocean,
of vegetation on the Peak of Teneriffe, 250.
Zoophytes, specific distribution of, 254.
LONDON: PRINTED BY W. CLOWES AND SONS, STAMFORD STREET,
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