See — Temperature of the Sun and Ages of Stars and Nebulae. 15 



y— 176868. 



The potential of the solar sphere upon itself * is given by 

 R i=i r> Ri 



~ \ * W + *\ ( ^ fi - ^o 5 ) + «*\ ( ^ 5 - ^ 6 ) 



+ + **, ( R\a i - fi*i ) \ ( 23 ) 



£ 



16tt 2 { „,,„ 16tt 2 

 -y- I o\R*dR = -y 



* Cf. A&tronomische Nachrichten, No. 3586. 



