Scientific knowledge is in perpetual evolution it finds itself changed from one day to the next.

Meaning: The rhyme presents a spring ague as medicine fit for a king. It gives a feverish illness a surprising positive value rather than simply treating it as misfortune.

Meaning: The saying treats apples, eggs and nuts as acceptable after someone it calls a slut. It uses a demeaning label while making an unverified claim about food handled by another person.

Meaning: April’s wind is pictured as a horn announcing favourable conditions for hay and corn. The saying links an early-season sign with a hoped-for later yield.

Meaning: The saying contrasts an Argus-like watcher at home with a mole abroad. It pictures someone sharply observant in familiar surroundings but much less perceptive elsewhere.