354 Mr. J. N. Lockyer. On the [May 6, 



Fia. 1 . Number of appearances of known and unknown lines. 



lower levels of the chromosphere which I first observed in 1871, and 

 which have been regularly recorded by the Italian observers since 

 that time; — all these phenomena and many others which may be 

 referred to at length on another occasion, are demanded by the hypo- 

 thesis, and are simply and sufficiently explained by it. 



