Possessing little knowledge or competence in either demography or economics, I am in no position to comment on the central portion of Professor Dovring's paper. Fortunately, I feel no call to do so, for I very much doubt that it can be faulted. No refinement of data or analysis is likely to set aside his basic conclusions. If the time intervals analyzed are made long enough to eliminate local fluctuations, accelerated rather than linear growth, whether of population or productive capacity, has characterized man's life on earth since at least the conquest of fire. Only historical myopia can account for the view that an increasing tempo of change dates only from the Industrial Revolution, that our current condition is, with respect to the existence of acceleration, essentially new.