the report should not neglect mention of them, and it is believed that other observers 

 in the north have noted similar occurrences. 



Dr. G. C. Simpson, F.R.S., and Dr. Charles Chree, F.R.S., have kindly criticised 

 the greater portion of the report which follows, and my best thanks are especially due 

 to the latter for his helpful interest in the work, and for supplying the whole of the 

 tabulated magnetic character numbers. 



C. S. W. 



September I5t/i, 1921. 



vui 



