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b r i e f l y r e f e r e n c e the e x p e r i m e n t a l t e c h n i q u e s s u i t a b l e f o r the u t i l i z a t i o n of t h e s e d at a. Th e c o m p u t e r p r o g r a m s u s e d w e r e w r i t t e n in F o r t r a n . D e t a i l e d p r i n t o u t s of the p r o g r a m s can be o b t a i n e d f r o m D r . P e t e r D e i n e s , 204 D e i k e Building, T h e P e n n s y l v a n i a State U n i v e r s i t y , U n i v e r s i t y P a r k , P A 16802. The c o m p l e t e p u b l i c a t i o n (129 p a g e s ) in p a p e r binding is a v a i l a b l e at $2.00 as B u l l e t i n 88 f r o m t h e E a r t h and M i n e r a l S c i e n c e s E x p e r i m e n t Station, M i n e r a l S c i e n c e s Bldg. C o l l e g e of E a r t h and M i n e r a l S c i e n c e s , Th e P e n n s y l v a n i a State U n i v e r s i t y , U n i v e r s i t y P a r k , P A 16802. 1. J. P. Coughlin: U.S. Bur. of Mines Bull., 1954, no. 542, pp. 1-80. 2. JANAF:Joint Army, Navy, and Air Force Thermochemical Tables, 2nd ed., pp. 1-1141, reissued by National Bureau of Standards as Ref. Data Ser. 37, Gaithersburg, Md., 1971. 3. A. Muanand E. F. Osborn:Phase Equilibria Among Oxides in Steelmaking, pp. 1-236, Addison-Wesley,Reading,Mass., 1965. 4. D. D. Wagman,J. E. Kilpatrick,W.J. Taylor, K. S. Pitzer, and F. D. Rossini: J. Res. Nat. Bur. Stand., 1945, vol. 34, pp. 143-62. 5. J. F. Elliotand M. Gleiser: Thermochemistry for Steelmaking, vol. 1, pp. 1-296, Addison-Wesley,Reading,Mass., 1960. 6. C. E. Wicksand F. E. Block: U.S. Bur. of Mines Bull., 1963, no. 605, pp. 1-147.

*Nowwith Texas Instruments, current residence-188 MarianaDrive, Richardson, TX 75080. G. C. U l m e r . In the e n s u i n g y e a r s , the n e c e s s a r y a l g e b r a i c e q u a t i o n s w e r e f r e e d f r o m all t h e i r s i m p l i f y ing a s s u m p t i o n s , the d a t a - b a s e f o r the f O a - T c a l c u l a tion was changed f r o m Coughlin I (1954) to J A N A F 2 (1965), and the g r a p h s of Muan and O s b o r n 3 (1965) p r e s e n t i n g t e m p e r a t u r e v s the lo g of the m i x i n g r a t i o have been c o r r e c t e d and e x t e n d e d . The g o a l s of t h i s new s et of t a b l e s a r e d i r e c t e d at m i x t u r e s of C O - C 0 2 , Hz-H20, and Ha-CO2 with a t h r e e fold p u r p o s e : 1) to p r o v i d e at one a t m o s p h e r e total p r e s s u r e the m o s t u n e q u i v o c a l s e t of e q u i l i b r i u m f O z - t e m p e r a t u r e data m a t h e m a t i c a l l y p o s s i b l e f r o m the J A N A F (1965) data b as e. 2) to p r o v i d e data f o r t h e i n i t i a l m i x i n g of g a s e s e x p r e s s e d in vol pct with s u f f i c i e n t d e t a i l to c o v e r a t e m p e r a t u r e r a n g e of 500 to 2000~ in 5~ s t e p s and to c o v e r an oxygen fugacity r a n g e of 10 -4 to 10 -28 a t m s in 0.10 l o g - u n i t s t e p s . 3) to a c c u r a t e l y c o m p a r e c a l c u l a t e d f O a - t e m p e r a t u r e r e l a t i o n s h i p s am o n g f i v e c o m m o