300 Proceedings of the Royal Irish Academy. 



The most probable constants for AsH are 



73 



m, = -—, {3 = 75, 



r' = 1-01952, co'2= 1-00284, 



w'2r' = 1-02243, /^ = 1-0912. 



Antimonurettecl Sydrogen. — The most probable constants for this 



gas are 



119 



'"-a =-7' ^-^ 



122, 



r"' = I, , a)'"2 = 



1-1033, 



/"y8 = - 1-2061. 





The most probable constants for SbH3 are 





m^ = ^ = - 30, ^ = 



122, 



r" = 1, co"^- = 



1-0678, 



/'/5 = + 0-06777. 

 The most probable constants for SbH are 



^1 = - 60, p = 122, 



r' = 1-01211, co'2 = 1-00130, 



oj'h-' = 1-01343, //3 = + 1-05523. 



IV. — Combination op Tetkad Elements with Htdeogen. 



"When a tetrad atom combines with four atoms of hydrogen, the 

 form of the general equations is the following : — 



r^-w'" = — ; + au {.■^J 



4m i 



,.v.,.v3^2,^^!^, (C) 



ix"ft = o)"-- - /l + 2sec45°\ .-g. 



\ [3-8284] /■ ^ 



