water or milk is added to prepared pancake flour to
make a batter, bubbles appear all through it.

558. When a roof leaks a _little_, a _large_ spot appears on
the ceiling.

559. Gasoline burns quietly enough in a stove, but if a spark
gets into a can containing gasoline vapor, there is a violent
explosion.

560. Turpentine will remove fresh paint.

GENERAL REVIEW INFERENCE EXERCISE

Explain the following:

561. We can remove fresh stains by pouring boiling water
through them.

562. A ship can be more heavily laden in salt water than in
fresh water.

563. Water flies off a wet dog when he shakes himself.

564. In cooking molasses candy, baking soda is often added to
make it lighter.

565. An egg will not stand on end.

566. Women who carry bundles on their heads stand up very
straight.

567. To get all crayon marks off a blackboard, the janitor
uses _vinegar_ in water.

568. Sunlight makes your skin darker.

569. Water puts out a fire.

570. You get a much worse shock from a live wire when your
hands are wet than when they are dry.

571. Stone or brick buildings are cool in summer but warm in
winter.

572. If you take the handle off a faucet, it is almost
impossible to turn the valve with your fingers.

573. Sparks fly from a grindstone when you are sharpening a
knife.

574. Violin strings are spoiled by getting wet.

575. The oxygen of the air gets into the blood from the lungs,
although there are no holes from the blood vessels into the
lungs.

576. You push a button or turn a key switch and an electric
lamp lights.

577. A rubber comb, rubbed on a piece of wool cloth, will
attract bits of paper to it.

578. People whose eyes no longer adjust themselves have to
have "reading glasses" and "distance glasses" to see clearly.

579. When you look through a triangular glass prism, things
appear to be where they are not.

580. Lye and hot water poured down a clogged kitchen drainpipe
clear out the grease.

581. You can draw on rough paper with charcoal.

582. When little children get new shoes, the soles should be
scratched and made rough.

583. You can get your face very clean by rubbing cold cream
into it, then wiping the cold cream off on a towel or cloth.

584. Soft paper blurs wr