Rixewoopn.—ÓOn Red 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 80 miles less than the first, or 2,182 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. 
Taste IL, showing the Mean Diurnal Velocity in English Miles of the 
Phenomena of Coloured Suns and Brilliant Sunsets in the Southern 
Hemisphere :— 
g d t 
og 5 : 
aiei 57 Z $ |$5£ 
or 2 5 S S 
BS g 3 E em 
= S = 4 o 
Hours. 
Mauritius .. ck os a s 44 1680 5 
= Days. 
Adelaida . +. se ... e| 234 | 94 | 3] e 
Capa ot- Good Hope — ..  .. ..| 24 2082 | 2047 | 2010 x 
Christchurch v "e e dy 291 2134 1990 2120 2070 
Means (Arith.) — 1984 2005 2065 2070 
Arithmetical mean .. = 2031 miles per diem. 
True mean of Ist column = 2100 ,, n 
