From the text ... 'Considerable study has been made of the effects of logging and slash burning on chemical and physical properties of the forest soils. However, little is known of the effect of such operations on microbiological properties.As a preliminary step toward defining the problem, this exploratory study was made on a logged and slash-burned portion of the Marys Peak area in the Coast Range near Corvallis, Oreg. Four factors were of particular interest: (1) Soil reaction, a good general indicator of severity of burning; (2) bacteria and (3) fungi, which play important roles in soil life processes, and (4) actinomycetes, which form a taxonomic link between bacteria and fungi and are of equal ecological importance.'