V O L U M E 2 2 , NO. 5, M A Y 1 9 5 0 (14) H a r d y , -4, C . , arid I'rrrin. I'. € I . , "I'rinciplrs of Optics," S e w Y o r k , 1IcC;ra\v-Hiil I30ok C'u,, 1832. (15) "International Critical Tatrlw," S e w l - n r k . RIcGraw-IIill Hook
649 I,nrentz, H. .L, W i e d : l r o ~ . , 9, 641 (1850). Loreiia, I,. V., I b i d . , 11, i o (1880). S o t i o n a l Bureau of Standards, Certificate for S t a n d a r d h n i l j l e s 21 l a , 217, and 218. I'erkin, IV. H., .J. ('hem. S o c . , 69, 1025 (18!46). Sellmcier. \V., Pogg. A n n . , 143, 272 ( 1 8 i l ) ; 145, 399, ,520 (1672): 147, 356, 525 (1872). S u n Oil u n ~ u l i l i s h e dd a t a . Thornc, H. k , , * l l u r p h y ,IY., a n d Ball, J. S., I s n . I k c . . C ' i i E i r , , \ T . \ L . En., 17, 481 (1945). T i l t o n , I,. I V , , a n d Taylor, J. Ti.,J . Rcscarch .Vatl. Bur. Sforidu r d , , 20, 418 (1938). T\.:ircI, .4. L., a n d l.'ulaeiler, IY.H . , I s n . Eso. CHEM!.. . \ x A I . .l , : i i , , 6, 396 (1834). \\.aid, ;\. L., and K u r t z . S . S . , J r . , I h i d . , 10, 559 (1035). \ \ . a d , A. I, , I i u r t a , S.8.. J r . , a n d Fulweiler, IV. If.. "Science of Petroleum," et1 by D u n s t a u , A . E., S a s h , A . IY.,T3t.ooks, I3. T..a n d Tizard, H . , \.nl. 11. p. 1137, London. Oxford I-niversity l'rese, 1935. Zeiss, C'nrl. I n r . , d a t a supplied with Pulfrich refractometer.
co..
(19) K u r t z , S. S.. Jr.. IIills, I. W., Martin. C. C., H a r v e y , \Y.T., and Tipkin. A I . R., A N \ I . . C R E M . 19, , 175 (1947). (20) K u r t z , S. S,,
