888 Transactions, — Miscellaneous, 
Taste L, showing the Mean Diurnal Velocity, in English Miles, of the 
Phonemena of Coloured Suns and Brilliant Sunsets, in the Northern 
Hemisphere :— 
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da "d o9 9 aq E od BEN 
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BEUERLERBI LZ LA41£ bed BE [L0 03 
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ae |S) a} oY a pe ta 1s HA 
H. 
Seychelles | 45 | 1802 
E. Coast of 
OM L 1817 | 1873 
GoldCoast| 4 | 1846 | 1969 | 1932 
Maranham, 5 | 2020 | 1950 | 1896 | 1904 
Trinidad 54) 1968 | 2080 | 2040 | 1940 | 2176 
anama..| 64) 2059 | 2040 | 2176 | 2324 | 1930 | 1986 
4000 miles 
of |} 81 
Panama 
Honolulu 94| 1900 | 2084 | 2080 | 2036 | 1909 | 1748 | 1716 | 1122 
2061 | 2424 | 2210 | 2493 | 2370 | 2338 | 2000 
India  ..| 12} 2162 | 2278 | 2192 | 2328 | 2212 | 2084 | 2200 | 2310 | 2244 
Lat. 24°N. |) 
net js 2132 | 2246 | 2206 | 2268 | 2165 | 2400 | 2170 | 2460 | 2316 | 2192 
30 W. 
Means (arith.)| 1976 | 2105 | 2091 | 2185 | 2127 | 2111 | 2022 | 1964 | 2280 | 2192 
Arithmetical mean = 2105 miles per diem. 
True mean of Ist column ‘= 2095 
The true mean of the first column, viz., that a - head of Java, is 
obtained by adding the distance between Krakatoa and each separate station - 
together, and dividing the aggregate by the gross total number of days. 
The way by whieh the distance between any two stations is derived is by 
multiplying the difference in degrees of longitude by the value of a degree 
in English miles, for the mean latitude of the two places. It must be remem- 
bered that between India and the last-named locality on the list, the dust 
cloud is supposed to have performed over a revolution and a half of the earth. 
I place great confidence in the result obtained from the observations 
deduced from India, because there there are scores of trained meteorological 
observers whose duty it is to immediately report any phenomenon that may 
take place, and such as that concerning which I speak could not have 
escaped their immediate notice: so we may conclude that the hour of its 
arrival there is very accurately determined, which gives a mean diurnal 
velocity of 2,162 miles: and taking the velocity from its journey and a half 
round the world from India to lat. 24° N. and long. 1403? W., we find it 
to be 2,192 miles a day, or 80 miles only in excess of the other computation. 
z E EROS 
PTUS E IEEE TRI 
NAP: Anu em. 
Dec rus UM Nj aie 
