Solutions of some very-high-molecular-weight polymers exhibit a solutionlike-meltlike theological transition-a crossover from a lower-concentration stretched-exponential regime (eta similar to exp(alpha c(v))) to a high-concentration power-law (eta similar to c(x)) regime at large concentration c. We report a detailed study of this transition for (hydroxypropyl)cellulose:water, with extensive sets of measurements in both concentration regimes and in the transition region. The transition between regimes is extremely sharp. Our experimental data are sufficiently fine-grained as to allow us to confirm the hitherto-untested result that eta is analytic (i.e., the logarithmic derivative partial derivative log(eta)/partial derivative log(c) is continuous) through the transition.