Reducibility (stochasticity in multiplicity distributions) and thermal scal
ing (one fragment emission probabilities are Boltzmann factors) are empiric
al features of nuclear multifragmentation shared by the Fisher Droplet Mode
l and by percolation. A new scaling feature (1/Z scaling) of the mt paramet
er of the binomial distribution shows that the fragmentation space is unifo
rmly explored and leads to a determination of the source size.