JOURNAL OF 



THE TRANSACTIONS 



or 



OB, 



Gener4l Secretary : Lecture Sbcrbtary : 



E. J. SEWELL. E. WALTER MAUNDER, F.R.A.S. 



VOL. L 



LONDON: 



(|3ul>Ujrt>rti tiy tt)r finititutp, 1, Central JSuillriufli^, mtiimiwiXtx, ^.m. i.) 



ALL BldHT&i BUSBBTUU. 

 1918. 



