This volume presents a group of selected papers given at the November, 1972, meeting of the Eastern Analytical Symposium. As has always been the intent of the series, "Progress in Analytical Chemistry," the papers are written by authorities who are also active workers in their fields. Included are applications of Raman Spectroscopy, X-Ray Diffraction, Emission Spectroscopy, Nu­ clear Magnetic Resonance, Liquid Chromatography, Thin-Layer Chromatography, Pyrolysis Gas Chromatography, Mass Spectrometry, Gas Chromatography and the powerful marriage of the last two. In modern analysis there is a constant search for applications of existing instrumentation in new ways to produce results hitherto unobtainable. In every case both the versatility of the researcher and the flexibility of the method used are amply illustrated. Thanks are due to the authors of the papers for their efforts in coping with the many problems of producing a manuscript in finished form enabling rapid publication. Ivor L. Simmons Galen W. Ewing v CONTENTS Raman Spectroscopy for the Study of Nematic Liquid Crystals . . . . . . 1 Bernard J. Bulkin Recent Developments in Arc Emission Spectroscopy: Introductory Remarks . . . . . . . . . . 13 Ramon M. Barnes Advances in the Static-Argon, DC-ARC Spectrochemical Source . . • . . 23 W. A. Gordon, K. M. Hambidge, and M. L. Franklin The Use of Calculated X-ray Powder Patterns in the Interpretation of Quantitative Analysis 45 C. Clark, D. K. Smith, and G. G. Johnson, Jr.