the desulfurization of trace quantities of benzothiophenes and aryl alkyl sulfides present in the thiaindan concentrate. However, any such contribution would be too small to invalidate the identifications reported. 1-Thiatetralin, retention time of 61 minutes in Figure 3, was looked for but not found in this concentrate. The tentative identifications based upon this desulfurization study are reasonably certain but lack final confirmation by spectral and GLC comparison with authentic reference samples of these compounds. These identifications are therefore listed as tentative. CONCLUSIONSWith the techniques described in this paper, the following 18 thiaindans were identified (three positively, 15 tentatively) in a Wasson, Texas, 200°to 250°C. distillate: 1-thiaindan, 2methyl-l-thiaindan, 3-methyl-l-thiaindan,

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