Thirties Reductionism said that once scientists knew the behavior of one of the Protons that made up Winston Churchill's body (and multiplied it by a trillion trillion trillion identical protons), they could then predict Churchill's behavior over the 1936 Abdication Crisis.
Thirties Reification said that Human Progress is real and concrete and since it was so clearly evident that Human Progress 'wants to get ever bigger and bigger',then dividing Human Progress up into the two billion individual people that existed in the world in 1939, would allow us to predict that particular individual Scott Nearing would also approve of things getting ever bigger.
But in fact he became famous for disagreeing bigger is better.