50 



GENERAL INDEX TO THE PHIL. MAG. AND ANNALS. 



Zenith distance, on the effect of a change 

 of polar distance, on the reduction of 

 a, ix. 338. 



Zero, natural, Sir G. Cayley on, v. 

 88. 



Zinc, action of sulphuric acid on, viii. 

 298. 



, chromate of, as a pigment, vii. 



60. 



, sulphuret of, artificial, i. 72. 



, sulphate of, and chromate of pot- 

 ash, Dr. Thomson on, iii. 81. 



Zoizite, H. J. Brooke on the charac- 

 ers of, x. 265. 



Zone of the 29th September, 1 828, (au- 

 rora borealis) iv. 1 8, 337, 389, 392, 

 393, 453, 463, 464. 



Zoological Society, ix. 52, 140, 222, 



366, 449 ; x. 55, 145, 229, 302, 389, 

 447; xi. 62, 132, 288,457. 



Zoology, i. 213, 391, 466; ii. 54, 66, 

 126, 207, 313; iii. 46, 68, 117. 



[The Zoological references to the suc- 

 ceeding volumes will be found distri- 

 buted wider their respective heads 

 throughout the Index, except the fol- 

 lowing :] 



Zoology : new species of wild swan, vii. 

 146, 194; viii. 128. 



: Fleming's dichotomous system, 



vii. 430. 



: Marsupial animals of Australia, 



xi. 59. 



: on the unity of organization in 



animals, vii. 379. 



Zurlite, or zurlonite, x. 190. 



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