Matthew 13:5

Some fell upon stony places.

Where the rocks that jut out of the hills into the plain had. very thin covering of earth, rendering it wholly impossible that the roots should penetrate beyond. certain depth, or draw up any supplies of nourishment from beneath. It is not expected by the farmer that anything sown upon it will come to full maturity. But the place comes within his sweep, as he sows the grain, and so some seeds fall upon it.-- Morison.

Forthwith they sprung up.

It sprang up sooner than the rest because the dry underlying rock drew the beat of the sun, and warmed the seed into earlier life.-- P.. And, while the rock below hindered it from striking deeply downward, it put forth its energies the more luxuriantly in the stalk.-- Trench.