Chemical Ionization Ion mobility spectrometry (CI-IMS) was used to characterize a number of wood species. A rapid test procedure was developed, based on the thermal release of vapors from heartwood samples followed by IMS analysis, with results being obtained In 5-10 s. Reduced mobility constants (K0) for the most significant peaks were calculated, and some of the Ions produced were mass-analyzed by In-

The gross value of products that can be manufactured from a tree is the starting point for a residual-value appraisal of a forest operation involving the harvest of trees suitable for making forest products. The amount of detail in a model of gross product value will affect the statistical properties of the estimate and the amount of ancillary information that is provided. Seven data sets from forest product recovery studies of western conifers were used in the evaluation of three models of gross product value. The evaluation of these models was based on the need for information and the statistical properties of the estimators. The most detailed method provided additional information, but at some loss in the precision and accuracy of the prediction of gross value of products from a log.

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