536 
Proceedings of the Royal Society of Edinburgh. [Sess. 
The agreement is as close as could be expected. The curvature confirms 
the result already obtained, viz. that \[r, the distance between the nodes of 
the orbit on Neptune’s and on the Earth’s equators, is becoming smaller. 
In conclusion, I desire to express my best thanks to Professor Dyson 
for the interest he has taken in the investigation and for his kind 
assistance. 
( Issued separately August 23 , 1909 .) 
