86 Proceedings of Royal Society of Edinburgh. [sess. 
established two new cosmic proofs of the validity of Doppler’s 
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principle, but it seems also clearly shown that the Edinburgh 
spectro- heliometer possesses 
an extraordinarily high 
degree of accuracy, which 
promises well for the future 
measurements of the solar 
rotation, and also for the 
eventual final decision on the 
question as to whether those 
enigmatic shifts of the solar 
lines mentioned above have 
to be assigned to a real cause. 
( Issued separately March 29 , 1906 .) 
ML 
*7 
