INDEX. 
Woodhouse, R. Esq. F. R. S. on the transit instrument of the 
Cambridge observatory, 75. 
Wrotham Hill , a trigonometrical station used for rocket signals 
in 1825, 78 et seq. 
Y 
Young, Dr. Thomas, For. Sec. R. S. on a formula for expressing 
the decrement of human life, 281. 
Young, Dr. Thomas, For. Sec. R. S., statement of a comparison of 
the sun’s observed and computed longitudes in 1820, 481. 
Z 
Zirconia, its power of emitting light when violently heated, 331. 
List of Presents. 
Meteorological Register. 
ERRATA. 
Page 262, line 21, for second, read, half second. 
263, line 1 6, after diminishing it, insert, they then return in a similar manner 
in an opposite direction. 
263, line 19, instead of before its termination, read, after its commencement. 
268, line 5, for not all, read, not at all. 
274, line 10, for became, read, because. 
From the Press of 
W. NICOL, 
Cleveland-row, St. James’s, 
