'So – excuse the confusion of this response – yes, we are not horses, we do not have their clear, rational, naked beauty; on the contrary, we are subequine primates, otherwise known as man. You say there is nothing to do but embrace that status, that nature. Very well, let us do so. But let us also push Swift's fable to its limits and recognize that, in history, embracing the status of man has entailed slaughtering and enslaving a race of divine or else divinely created beings and bringing down on ourselves a curse thereby.'

It is three fifteen, a couple of hours before his mother's last engagement. He walks her over to his office along tree-lined paths where the last autumn leaves are falling.

'Do you really believe, Mother, that poetry classes are going to close down the slaughterhouses?'

'No.'

'Then why do it? You said you were tired of clever talk about animals, proving by syllogism that they do or do not have souls. But isn't poetry just another kind of clever talk: admiring the muscles of the big cats in verse? Wasn't your point about talk that it changes nothing? It seems to me the level of behaviour you want to change is too elementary, too elemental, to be reached by talk. Carnivorousness expresses something truly deep about human beings, just as it does about jaguars. You wouldn't want to put a jaguar on a soybean diet.'

'Because he would die. Human beings don't die on a vegetarian diet.'

'No, they don't. But they don't want a vegetarian diet. They like eating meat. There is something atavistically satisfying about it. That's the brutal truth. Just as it's a brutal truth that, in a sense, animals deserve what they get. Why waste your time trying to help them when they won't help themselves? Let them stew in their own juice. If I were asked what the general attitude is towards the animals we eat, I would say: contempt. We treat them badly because we despise them; we despise them because they don't fight back.'

'I don't disagree,' says his mother. 'People complain that we treat animals like objects, but in fact we treat them like prisoners of war. Do you know that when zoos were first opened to the public, the keepers had to protect the animals against attacks by spectators? The spectators felt the animals were there to be insulted and abused, like prisoners in a triumph. We had a war once against the animals, which we called hunting, though in fact war and hunting are the same thing (Aristotle saw it clearly). That war went on for millions of years. We won it definitively only a few hundred years ago, when we invented guns. It is only since victory became absolute that we have been able to afford to cultivate compassion. But our compassion is very thinly spread. Beneath it is a more primitive attitude. The prisoner of war does not belong to our tribe. We can do what we want with him. We can sacrifice him to our gods. We can cut his throat, tear out his heart, throw him on the fire. There are no laws when it comes to prisoners of war.'

'And that is what you want to cure humankind of?'

'John, I don't know what I want to do. I just don't want to sit silent.'

'Very well. But generally one doesn't kill prisoners of war. One turns them into slaves.'

'Well, that's what our captive herds are: slave populations. Their work is to breed for us. Even their sex becomes a form of labour.

We don't hate them because they are not worth hating any more. We regard them, as you say, with contempt.

'However, there are still animals we hate. Rats, for instance. Rats haven't surrendered. They fight back. They form themselves into underground units in our sewers. They aren't winning, but they aren't losing either. To say nothing of the insects and the microbia. They may beat us yet. They will certainly outlast us.'

The final session of his mother's visit is to take the form of a debate. Her opponent will be the large, blond man from yesterday evening's dinner, who turns out to be Thomas O'Hearne, professor of philosophy at Appleton.

It has been agreed that O'Hearne will have three opportunities to present positions, and his mother three opportunities to reply. Since O'Hearne has had the courtesy to send her a précis beforehand, she knows, broadly speaking, what he will be saying.

'My first reservation about the animal-rights movement,' O'Hearne begins,'is that by failing to recognize its historical nature, it runs the risk of becoming, like the human-rights movement, yet another Western crusade against the practices of the rest of the world, claiming universality for what are simply its own standards.' He proceeds to give a brief outline of the rise of animal-protection societies in Britain and America in the nineteenth century.

'When it comes to human rights,' he continues, 'other cultures and other religious traditions quite properly reply that they have their own norms and see no reason why they should have to adopt those of the West. Similarly, they say, they have their own norms for the treatment of animals and see no reason to adopt ours – particularly when ours are of such recent invention.

'In yesterday's presentation our lecturer was very hard on Descartes. But Descartes did not invent the idea that animals belong to a different order from humankind: he merely formalized it in a new way. The notion that we have an obligation to animals themselves to treat them compassionately – as opposed to an obligation to ourselves to do so – is very recent, very Western, and even very Anglo-Saxon. As long as we insist that we have access to an ethical universal to which other traditions are blind, and try to impose it on them by means of propaganda or even economic pressure, we are going to meet with resistance, and that resistance will be justified.'

It is his mother's turn.

'The concerns you express are substantial, Professor O'Hearne, and I am not sure I can give them a substantial answer. You are correct, of course, about the history. Kindness to animals has become a social norm only recently, in the last hundred and fifty or two hundred years, and in only part of the world. You are correct too to link this history to the history of human rights, since concern for animals is, historically speaking, an offshoot of broader philanthropic concerns – for the lot of slaves and of children, among others.

'However, kindness to animals – and here I use the word kindness in its full sense, as an acceptance that we are all of one kind, one nature – has been more widespread than you imply. Pet-keeping, for instance, is by no means a Western fad: the first travellers to South America encountered settlements where human beings and animals lived higgledy-piggledy together. And of course children all over the world consort quite naturally with animals. They don't see any dividing line. That is something they have to be taught, just as they have to be taught it is all right to kill and eat them.

'Getting back to Descartes, I would only want to say that the discontinuity he saw between animals and human beings was the result of incomplete information. The science of Descartes' day had no acquaintance with the great apes or with higher marine mammals, and thus little cause to question the assumption that animals cannot think. And of course it had no access to the fossil record that would reveal a graded continuum of anthropoid creatures stretching from the higher primates to Homo sapiens - anthropoids, one must point out, who were exterminated by man in the course of his rise to power.

'While I concede your main point about Western cultural arrogance, I do think it is appropriate that those who pioneered the industrialization of animal lives and the commodification of animal flesh should be at the forefront of trying to atone for it.'

O'Hearne presents his second thesis.'In my reading of the scientific literature,' he says,'efforts to show that animals can think strategically, hold general concepts or communicate symbolically, have had very limited success. The best performance the higher apes can put up is no better than that of a speech-impaired human being with severe mental retardation. If so, are not animals, even the higher animals, properly thought of as belonging to another legal and ethical realm entirely, rather than being placed in this depressing human subcategory? Isn't there a certain wisdom in the traditional view that says that animals cannot enjoy legal rights because they are not persons, even potential persons, as foetuses are? In working out rules for our dealings with animals, does it not make more sense for such rules to apply to us and to our treatment of them, as at present, rather than being predicated upon rights which animals cannot claim or enforce or even understand?'

His mother's turn. 'To respond adequately, Professor O'Hearne, would take more time than I have, since I would first want to interrogate the whole question of rights and how we come to possess them. So let me just make one observation: that the programme of scientific experimentation that leads you to conclude that animals are imbeciles is profoundly anthropocentric. It values being able to find your way out of a sterile maze, ignoring the fact that if the researcher who designed the maze were to be parachuted into the jungles of Borneo, he or she would be dead of starvation in a week. In fact I would go further. If I as a human being were told that the standards by which animals are being measured in these experiments are human standards, I would be insulted. It is the experiments themselves that are imbecile. The behaviourists who design them claim that we understand only by a process of creating abstract models and then testing those models against reality. What nonsense. We understand by immersing ourselves and our intelligence in complexity. There is something self-stultified in the way in which scientific behaviourism recoils from the complexity of life.

'As for animals being too dumb and stupid to speak for themselves, consider the following sequence of events. When Albert Camus was a young boy in Algeria, his grandmother told him to bring her one of the hens from the cage in their backyard. He obeyed, then watched her cut off its head with a kitchen knife, catching its blood in a bowl so that the floor would not be dirtied.

'The death cry of that hen imprinted itself on the boy's memory so hauntingly that in 1958 he wrote an impassioned attack on the guillotine. As a result, in part, of that polemic, capital punishment was abolished in France. Who is to say, then, that the hen did not speak?'

O'Hearne. 'I make the following statement with due deliberation, mindful of the historical associations it may evoke. I do not believe that life is as important to animals as it is to us. There is certainly in animals an instinctive struggle against death, which they share with us. But they do not understand death as we do, or rather, as we fail to do. There is, in the human mind, a collapse of the imagination before death, and that collapse of the imagination – graphically evoked in yesterday's lecture – is the basis of our fear of death. That fear does not and cannot exist in animals, since the effort to comprehend extinction, and the failure to do so, the failure to master it, have simply not taken place.