Even during heavy seed-crop years, only about 25% of trees in closed stands produce an appreciable number of cones.

For a chemical reaction to proceed at a reasonable rate, there should exist an appreciable number of molecules with energy equal to or greater than the activation energy.

Barn owl populations do rise and fall in cycle with vole populations and, being largely nocturnal, there may also be appreciable numbers going unrecorded.

Only the towns that had made an issue of issuing licenses to out-of-staters had appreciable numbers of them.

Professionally trained metalsmiths were graduating from art schools and community colleges in appreciable numbers.