May 15, 1941 A N A L Y T I C A L E D I T I O N 305

(25) McArdle, E. H., Chem. & Met. Eng., 44, 598 (1937).

TOLUENE 35 I CCWMERCIAL SOLVENT NAPHTHAS

I CONCCWWANCE BETWEEN KAURI-BUTANOL-- I VALUE AND SPECIFIC DISPERSION OF

-~ - ~ -~ HIGHLY AROMATIC NAPHTHAS

- -

150 160 170 I80 SPECIFIC DISPERSION AT 20 "C ('IO4)

FIGURE 12

FIGURE 13

IO

- ol -20 ,o I-

$30 a W

540

5 0 W 5 50 2

60

AVERAGE BOILING POINT, O F

FIGURE 14

(26) IM'cArdie, E. H., IND. ENG. CHEM., Anal. Ed., 11, 450 (1939).

(27) McArdle, E. H., Moore, J. C., Terrell, H. D., Haines, E. C.. and coorwrators. IIbid., 11, 248 (1939).

(28) Maman, A., Pub. Sci. Tech. Minis the Air (France), No. 66, 55 (1935).

(29) Metzinger, E. F., Paint, 00 Chem. Rev., 99, No. 10, 9 (1937).

(30) Philadelphia Paint and Varnish Production Club, Federation of Paint and Varnish Pro- duction Clubs, Tech. Proc . ,p . 115 (1939).

(31) Philadelphia Paint and Varnish Production Club, Natl. Paint, Varnish Lacquer Assoc., Sci. Sec. Circ. 523, 323 (1936).

(32) Ibid., 546, 273 (1937). (33) Ibid., 568, 381 (1938). (34) Philadelphia Paint and Varnish Production

Club, Paint, Oil Chem. Rev., 97, No. 23, 91 (1935).

(35) Rubek, D. D., and Dahl, D. W., IND. ENG. CHEM., Anal. Ed., 6, 421 (1934).

(36) Stewart, J. K., Dorsch, J. B., and Hopper, C. B., IND. ENG. CHEM., 29, 899 (1937).

(37) Stewart, J. R., Amer. Paint Varnish Mfgrs. Assoc., Circ. 378, 143 (1931).

(38) Sweeney, W. J., and McArdle, E. H., IND. ENG. CHEM. (in press).

(39) Sweeney, W. J., and Tilton, J. A,, Zbid. , 26. 693 (1934).

(40) Thorn, F. C., and Bowman, C., Ibid., Anal.

(41) Tizard, H. T., and Marshall, A. G., J. SOC.

(42) Ubbelohde, L., J . I m t . Petroleum Tech.. 23.

Ed., 8, 432 (1936).

Chem. Ind., 40, 20T (1921). , .

427 (1937). (43) Wetlaufer, L. A., and Gregor, J. B., IND.

ENG. CHEM., Anal. Ed., 7, 290 (1935). (44) Wilson, M. M., and Worster, F. J., IND. ENQ.

CHEM., 21, 592 (1929). (45) Wolff, H., and Toeldte, W., Paint Varnish

Production Mor., 18, No. 2, 43 (1938).

Instrumental Methods of Chemical Analysis

OLLOWIIYG the precedent set by the F October, 1940, ANALYTICAL EDITION, which dealt with American apparatus, instru- ments, and instrumentation, the October, 1941, issue will contain a systematized classification of instrumental methods of chemical analysis, covering the fundamental theory, description of equipment, and applications. Key references and the more important literature sources for each method will be included.

Readers of this journal can render invaluable aid to this undertaking and to their fellow chem- ists by supplying illustrations of actual installa- tions with brief description or reference to any pertinent publications. Such examples will be of interest if they present results of high pre- cision, ways of time-saving, handling large volume of work, or operation by relatively un- skilled help, or are completely automatic.

Universities, research institutes, industrial laboratories, instrument companies, and govern- mental services, as well as individuals are earn- estly requested to cooperate, so that the general treatment may be enhanced by illustrations of actual installations.

Information or questions should be addressed to Ralph H. Muller, Department of Chemis- try, Kew York University, Washington Square East, Kew York, S. Y.