296 Proceedings of the Royal Irish Acadeimj. 



Telluretted Sydrogen (HTeH). — If we suppose r" = 1, we find 



2-/3 

 m^ = -^ = - 31i /3 = 128, 



w"' = 1-06449. 

 The most favourable values for HTe would be 

 ?wi = - 63, 13 = 128, 

 r' = 1-01180, 



a>'2 = 1, 

 w'V = 1-01180. 

 (HTe) //? = 1-05206, 

 (HTeH) ix"l3 = 0-06449, 

 being less than one-sixteenth the attraction in HTe. 



III. CoMBINAXIOIf OF TeIAD ElEMEKTS WITH HxDEOGEN. 



Ammonia Type. 



In this case, three molecules of hydrogen combine with one 

 molecule of nitrogen to produce two molecules of ammonia. 

 The most general equations of this type are 



3m.Q 



+ a„ (A) 



/-.- + 2e3 = '-^^, (C) 



fi."'/3 = a)"'2-2sec 30°. (B) 



If we suppose that ammonia is produced at the cheapest rate, we have 



63 = 0, 03 = 0, 



and (A) and (C) become 



^m2.ju 3^3 + ^ 



Eliminating a>"', we find 



9^3^ + 3^" 

 When r'" = 1, 



... 3-^8 



