INDEX. 



523 



ZETA. 



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- 



ZOOPHYTES. 



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 nebulae, 423. 



Zones of instability of planetary orbits, 

 21. 



of temperature in the ocean, 



101. 



of vegetation on the Peak of 



Teneriffe, 250. 



Zoophytes, specific distribution of, 

 254. 



THE END. 



LOXDOJT; PRINTED BY W. CLOWES AND SOXS, STAMFORD STREET, 

 AXD CHAJUIXG CROSS. 



