1. S₁: Ingratitude stings strongest where relationship is closest.
S₆: From any warm and healthy human relationship expectation of returns has to be weeded out.

P: Expectation turns innocent relationship into commerce.
Q: Human relationship is adulterated with sly commerce.
R: In commerce, of course, give and take is understood.
S: Most relationships are founded on mutual expectations.

2. S₁: Useful human beings are divided into two classes : those whose work is work and pleasure is pleasure; and those whose work and pleasure are one.
S₆: For them the working hours are never long enough.

P: The long hours in the office or factory give them keen appetite for pleasure even in its most modest forms.
Q: Their life is a natural harmony.
R: Of these the former are in majority.
S: But Fortune's favoured children belong to the second class.

3. S₁: Most people know that economics deals with such items as population, natural resources, incomes, tariffs, money and prices.
S₆: From this view, human behaviour is seen as activity directed towards the achievement of various objectives through the use of various resources.

P: Instead, it is how it organises and analyses its materials; it is the perspective from which it views the world that makes it a special field of study.
Q: However, it is not what economics deals with that makes it a distinctive science.
R: Indeed, the list of topics can be greatly extended.
S: Economics is a particular view of reality.

4. S₁: Human ways of life have steadily changed.
S₆: During the last few years change has been even more rapid than usual.

P: From that time to this, civilisation has always been changing.
Q: About ten thousand years ago, man lived entirely by hunting.
R: Ancient Egypt -Greece - the Roman Empire - the Dark Ages and the Middle Ages - the Renaissance the age of modem science and of modern nations - one has succeeded the other; and history has never stood still.
S: A settled, civilised life began only when agriculture was discovered.

5. S₁: Of the various kinds of insect defences that of the North American fungus - eating beetle is quite unusual.
S₆: The beetle's chemical secretion keeps the deer mouse at bay.

P: Both ants as well as mammals such as deermice feed on this beetle.
Q: This little beetle is able to recognize the kind of predator coming towards it and accordingly adopts a suitable defence.
R: When facing a deermouse, the beetle secretes an irritant from certain glands in its abdomen.
S: While the beetle simply rolls itself into a compact ball in the face of an ant attack, it copes with the deer mouse differently.

6. S₁: The houses in the Indus Valley were built of baked bricks.
S₆: They led outside into covered sewers which ran down the side of the streets.

P: This staircase sometimes continued upwards on to the roof.
Q: Access to the upstairs rooms was by a narrow stone staircase at the back of the house.
R: The drains were incorporated in the walls.
S: The houses had bathrooms and water closets, rubbish chutes and excellent drainage systems.

7. S₁: Man has existed for about a million years.
S₆: What its future effects will be is a matter. of conjecture, but possibly a study of its effects hitherto may make the conjecture a little less hazardous.

P: Science' as a dominant factor in determining the beliefs of educated men, has existed for about 300 years; as a source of economic technique, for about 150 years.
Q: When we consider how recently it has risen to power, we find ourselves forced to believe that we are at the very beginning of its work in transforming human life.
R: In this brief period it has proved itself an incredibly powerful revolutionary force.
S: He has possessed writing for about 6,000 years, agriculture somewhat longer, but perhaps not much longer.

8. S₁: Widowhood in India used to be specially miserable.
S₆: Today nobody looks upon remarriage of widows with disgust or disapproval.

P: There were widows even in ages ranging from five to ten.
Q: A widow was a widow always.
R: However, several communities began to rebel against the illtreatment of widows.
S: She could not marry ugain however tender in age she might be.

9. S₁: The path of Venus lies inside, the path of the Earth.
S₆: When at, its brightest, it, is easily seen with the naked eye in broad daylight.

P: When at its farthest from the Earth, Venus is 160 million miles away.
Q: With such a wide range between its greatest and least distances it is natural that at sometimes Venus appears much brighter than others.
R: No other body ever comes so near the Earth, with the exception of the.Moon and an occasional comet or asteroid.
S: When Venus is at its nearest to the Earth, it is only 26 million miles away.

10. S₁: The Hound of Baskervilles was feared by the people of the area.
S₆: The Hound of Baskervilles remains an unsolved mystery.

P: Some people spoke of seeing a huge, shadowy form of a hound at midnight on the moor.
Q: But they spoke of it in tones of horror.
R: Nobody had actually seen the hound.
S: This shadowy form did not reveal any details about the animal.