PLATE III. 



Fig. 1. — The K line on the solar disk nnd in the chromosphere at the limb 

 (radial slit). The l>right reversals (KJ are due to the flo<-culi. Where faculjTe 

 are present the continuous sf>ectruni is more or less streuKtheiu^. 



Fig. 2. — Reversals of the H and K lines in the electric arc, showing the de- 

 crease in width from the inner (dense) to the outer (rare) calcium vajjor. 



Fig. 3. — Minute calciinu tlocculi, resembling the granulation of the photo- 

 sphere. The squares are 10" of arc on a side. 



148 



