120 



Mr. 11. Moon on the Theory of 



v ,(<iy\\ y>(&) 



0= M*j v W ? dy 



_. rdii\ D ™ /dv\ doe 



(I) " "(I) 



uv/^ 





da? 



_ 2 FW + F'(y)| 



(I) 



ich g 

 F '(l) V ± ^V + 4ED 



P(fl + F(y) 





(5) 



the first of which gives us 



dy 

 dx 



© 



2D 



(«) 



Let 



*H£D-*(-i4.)-***>' 



then 



F '(I)= F '(?) = -&>H 



F'(|)=/'W, »*.(•)-/(*), *%)=/M, F'(0=/Wj 



therefore (6) gives us 



while from (5) we get, reducing, 

 D 



(7) 



1) 



2D 



or 



o = (l£^±4V)/ W+ /'W 



/must satisfy (7) and (8) simultaneously. 



\ 2p 



(8) 



