Applies an inductive experimental approach to recognize, control, and resolve the variables that effect the wine-making process and the qual ity of the final product{focusing on the grape variety-yeast interacti on controversy. Contains over 300 original drawings, photographs, and photomicrographs-unavailable in any other source-that illustrate the d iagnostic morphology of wine yeast and bacteria used to track wine spo ilage and related problems. Promotes a better understanding of the bio technological phenomena in the wine-making process in which yeast enzy mology plays a key role with plant physiology.