388 



Transactions, — Miscellaneous, 



Table I., showing the Mean Diurnal Velocity, in English Miles, of the 

 Phonemena of Coloured Suns and Brilliant Sunsets, in the Northern 

 Hemisphere : — 





a r, 







o 











H 







— 



o += 



-m ca 



> 



I* 



c3 

 > 



l-S 



<D 



East Coas 

 Africa. 



c3 

 O 



o 



o 



c3 



a 



T3 



'a 



g 



a 



P4 



^ 3 

 Sen 



O cw 

 O O 



o 



5 



13 



o 



a 

 o 



W 



e3 



a 



h- 1 



Seychelles 



H. 



45 



1802 





















E. Coast of 

 Africa . . 



158 



}d. 



4 



1817 



1873 



















Gold Coast 



1846 



1969 



1932 

















Maranham 



5 



2020 



1950 



1896 



1904 















Trinidad 



5* 



1968 



2080 



2040 



1940 



2176 













Panama . . 



6* 



2059 



2040 



2176 



2324 



1930 



1986 











4000 miles 



' 























West of 



'■8t 



2061 



2424 



2210 



2493 



2370 



2338 



2000 









Panama 

























Honolulu 



n 



1900 



2084 



2080 



2036 



1909 



1748 



1716 



1122 







India 



12} 



2162 



2278 



2192 



2328 



2212 



2084 



2200 



2310 



2244 





Lat.24°N. 



^ 























Long. 140- 



i s 



2132 



2246 



2206 



2268 



2165 



2400 



2170 



2460 



2316 



2192 



30 W. 



j*i 























Means (arith.) 



1976 



2105 



2091 



2185 



2127 



2111 



2022 



1964 



2280 



2192 



Arithmetical mean 



True mean of 1st column 



2105 miles per diem. 

 2095 „ 



The true mean of the first column, viz., that under the 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 which 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. 140^° W., we find it 

 to be 2,192 miles a day, or 30 miles only in excess of the other computation. 



