1886.] Sun-spot Spectra Observations at Kensington. 357 



Fia. 3. Minimum. 



Tracing of the results obtained by the cameras in 1878, showing inner portion of 

 equatorial extension, and how the surfaces of it cut the concentric atmo- 

 sphere in lat. 35 N. and S., or thereabouts. 



The view of the solar circulation at which I have arrived may be 

 briefly stated as follows :— 



There are upper outflows from the poles towards the equatorial 

 regions. In these outflows a particle constantly travels, so that its 

 latitude decreases and its height increases, so that the true solar 

 atmosphere resembles the flattened globe in Plateau's experiment 

 (see photographs, 1878, and fig. 3). 



These currents, as they exist in the higher regions of the atmo- 

 sphere, carry and gather the condensing and condensed materials till 

 at last they meet over the equator. 



There is evidence to show that they probably extend as solar 

 meteoric masses far beyond the limits of the true atmosphere, and 

 form a ring, the section of which widens towards the sun, and the 

 base of which lies well within the boundary of the atmosphere (fig. 2) . 



If we assume such a ring under absolutely stable conditions, there 

 will be no disturbance, no fall of material, therefore there will be no 



