Abstract
By a Monte Carlo simulation of a grand canonical ensemble for a lattice tree model of branched polymers in three dimensions the author obtains the estimates theta =1.501+or-0.043, nu =0.495+or-0.013 for the critical exponents. These estimates strongly support the exact conjecture theta =3/2, nu =1/2 by Parisi and Sourlas (1981) obtained using dimensional reduction. The attrition constant mu is also estimated.