218 



Professor Dewar 



[June 6, 



The group calcium, barium, and strontium on the one hand, and 

 sodium, lithium, magnesium, and hydrogen, on the other, seem to 

 behave in a similar way in the chromosphere of the sun ; but before 

 definite conclusions can be reached regarding the sequence of the 

 reversals, a further series of long and laborious experiments must be 

 executed. 



[J. D.] 



