446 MOSSOTTI OX FRAUNHOFER*S RETICULAR SPECTRA. 



A, which it verifies, may belong to the maximum of G. I thus 

 obtain 



dr d^x ^ 



dx 



dK- 



and from this eUminating w G by means of the previous equa- 

 tion. 



dr 

 dx 



d^.v 

 dx" 

 dx 

 d\ 



r; 



and considering that the equation (8.) gives 



^_ 1 dr _ dx 1 



* 1 +x' dx dx' {I +xr 



on substituting x instead of F, we have 



1% = ^ (1 + y). 

 dx dx^^^' 



dx 



d, V cl oc d cc 



The values of -7^, and -r-z, : -j-, to be substituted in this 

 dK dx'- dx 



equation, must be obtained by differentiation from the equations 



(6.) and (5.), which gives 



3 _ V J , 3x(2-3x) , 12%^(3-2x+x")e"^ 1 ^ 



^ - ~4.3-'7r] ^~ Jl'^ _3 [dx 



dx""' 



'kH 



SA + lOAl-^ 



"+"(r) 



^-|«^tangi('H-* + ^) 



dx 

 dx 



and with these values the previous equation takes the following 

 form : — 



in which for brevity we have substituted H for the quantity 



