Third of six lectures by Jubian Huxley , F.R.S.
Biological Improvement:
The Second Evolutionary Equation
The theme of this lecture is that Natural Selection, plus adequate time, produces biological improvement. Dr. Huxley gives examples of the different kinds and degrees of biological improvement, and of rhe ways in which improvement is restricted and limited in different evolutionary circumstances. He discusses whether one can properly distinguish between ' higher * and lower ' animals. or speak of ' progress ' in evolution. He concludes that biological progress, though infrequent, is a fact, and in the long run the most important fact of evolution.