This paper discusses the rate of burning of wood cribs and the comparison
between the data of O'Dogherty and Young and Webster, and a theoretical model
having much in common with Block's. It is suggested that the source of a
discrepancy between the data and Block's original theory is the over-simplification
of an averaging procedure for the mass transfer process and the use of the
Reynolds analogy. Difficulties remain with describing the pyrolysis process
and the mixing of the fuel and air in the crib shafts which preclude too
exacting a comparison between present theories and currently available data.
