870 P. E. Chase— Velocity of Primitive Undulation. 
ia 
1. The common ratio of the geometrical series, n?, is very 
. mass of sun ; 
nearly, if not exactly, v a of alec’ r/ ‘4 being the ra 
dius of spherical gyration. 
. The number of vibrations of the mean caloriferous rays, 
in ‘the unit of time which satisfies all the equations of the 
geometrical series, is nearly,.if not exactly, the cube of 
X<sun’s mas 
3. If the sun’s velocity of equatorial rotation be regarded as 
the velocity at the vertex of a parabolic wave, and conse- 
Sept., 1872. 
If we were to suppose a slight ethereal expansion by the 
intense heat at the sun’s surface, the inrushing colder ther 
might produce gyrations analogous to our atmospheric cyclones. 
But independent of any such hypothesis, it is by no means cer- 
tain that there may not be some slight progressive ethereal 
motion, combined with the motion of wave-form, or some radial 
oscillation accompanying the transverse light-undulations. 
Any such progressive motion, capable of communicating, at 
Whatever difficulties we may find in trying fully to account 
for the foregoing accordances, these sina are well estab- 
lished facts in nature. They are facts in perfect ap ee with 
Newton’s original hypothesis, as well as with the hydro-dy- 
namic and mechanical investigations of Challis, Norton, and 
Leray, with the experiments upon cosmo-plastic forces, and 
* g=Y .-./ 2gh = 2V/ fh. + Proc. A. P, S., xii, 518-22, 
