PI, ATE VII. 



Fio. 1.— For this photogrniih the soeond slit was set on the contimions spec- 

 trum at .'>!)24. Conse(iueiitl.v no tlocenli are shown, thougli the facul.-c are faintly 

 visible. The forms of the latter should he compared with those of the tlocculi 

 in the other fii^ures. 



Fic. 2. — Low Ki level. Slit set at .'1020. This shovv's the dense calcium vai)or 

 not far al>ove the photosphere. Compare with fig. 1 and note that even at this 

 low level the calcium vapor overhangs and sometimes completely covers small 

 spots. 



152 



i 



