Address of Sir William Thompson. 287 
Sary to suppose the nebulous matter to have been originally 
fiery, but that mutual gravitation between its parts may have 
generated the heat to which the present high temperature of 
the Sun is due. Further, he made the important observations 
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on of the very approximate constancy of the Earth’s period 
of revolution round the Sun for the last 2, years, to con- 
assumed to circulate at any consi t 
1 the Sun must be very small; and therefore, “if the me- 
¢ influx taking place at present is enough to produce any 
reciable portion of the heat radiated away, it must be sup- 
