628 



The Earl of Bosse 



[May 31, 



reduced to about 98 per cent, of its full value. At the time of last 

 contact with the penumbra the heat was 80 ■ 6 only, and 1 hr. 40 min. 

 later, 81 per cent, only of its full value. Thus the result arrived at 

 in 1884 for the second period of the eclipse was fully confirmed. 



Slide 7 exhibits the course of the changes of heat radiation during 

 the progress of this eclipse. 



Fig. 



In 1884 the Moon rose eclipsed, and clouds interfered until 

 23 minutes before the total phase. This time good observations from 

 over an hour before the first contact with the penumbra were possible. 

 Thus the values after the eclipse could be compared with those before 

 the eclipse on the same night. 



t>."ltnlia 



Fig. 8. 



So far as could be perceived, the sky was cloudless and unchanged 

 through the whole period of the observations. It will be observed 

 that the heat declined to less than 1 per cent, during totality. Why 

 did it not rise equally after the eclipse ? Can it be that at the lower 

 temperature of the eclipsed lunar surface the residual surface-heat 

 was less capable of penetrating the Earth's atmosphere ? Can it be 



