Eingwood. — On Reel Sunsets. 



389 



But if we take the whole journey from Krakatoa to that locality, about 

 two and three-quarters revolutions round the globe, we find the mean 

 to be 30 miles less than the first, or 2,132 miles, and this will be accounted 

 for through the diminished value of the degree in longitude, at the mean 

 latitude between Java and lat. 24° N. 



The mean diurnal velocities obtained from the intermediate stations 

 between Java and India agree very closely when we consider that at those 

 several places the phenomenon was wholly unexpected, and thus, in most 

 instances, the dates and times given appear to be somewhat late, it being 

 quite possible and natural that it escaped notice at least once ; in India, 

 however, we may conclude that they were on the alert, ( and consequently 

 the mean velocity deduced from that place ought to bear great weight. 

 There is another thing that ought not to be lost sight of — viz., that without 

 this list of stations, more than encircling the globe, one might suppose that 

 the cloud after leaving Krakatoa stretched away westward, and as I gather 

 from Lockyer's paper by his North-South line, to have extended to the north 

 and south, forming a letter V with the apex at the Straits of Sunda. Now, 

 Lockyer tracks it to Panama, to which place we see it to have had a diurnal 

 velocity of 2,059 miles, and from Panama to India I made it 2,200 miles 

 a day, which makes me believe that the cloud was performing a spiral 

 path northwards round the globe. 



Before proceeding I will now refer to the observations in the southern 

 hemisphere in order to see whether the same has taken place there. This 

 table has been prepared in like manner to the former — viz., the dates and 

 times are reduced to that of Krakatoa, and the distances in English miles 

 obtained from the difference in degrees of longitude reduced to the value of 

 the mean latitude of the two places. 

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



Phenomena of Coloured Suns and Brilliant Sunsets in the Southern 



Hemisphere : — 



— 



I * 



1-8 



.5 

 's 



P 

 c3 



3 



'8 



< 



o 



O ft 



offl 



d 



Mauritius 



Cape of Good Hope 



Christchurch 



Hours. 



44 

 Days. 



m 



24 



29J 



1680 

 2041 

 2082 

 2134 



1980 

 2047 

 1990 



2010 

 2120 



2070 



Means (Arith.) 



— 



1984 



2005 



2065 



2070 



Arithmetical mean . . = 2031 miles per diem. 



True mean of 1st column = 2100 „ „ 



