Gymnopus californianus January 14, 1947 Berkeley, Cal. population of a small effective breeding po number, certain genes tend to become fixed & others lost, by chance, regard- less of selection. Do - non-adaptive differences might became fixed. The species would lose its variability - became homogeneous. Success in selection passo It mo eventually would wander from its adaptive peak & possibly thus became extinct by non-adaptive change. If environment changed, the species would not be able to change & adapt itself to new conditions. Perhaps Wright's concept would fit cardos - in certain respects. They do seem to be an isolated interbreeding group. To pre- serve cardos we might find ourselves chang- ing the environment to suit their non- adaptive trends. Cardos do seem to be specialized - especially physiologically - in comparison with more successful kinds. January 17, 1947 Berkeley, Cal. Mr. Cronemiller, in charge of wild life in the forest region including the Los Padres, visited the M.V.Z. to discuss cardos with me.