Meaning swarthy foreigners like little Cristo Gomez, Alf Pereira, Pete Queval, Donkey Camus of the Lower Fifth. They had money, and they would buy women (the ones that hung round the corner of Merle Street and London Road) whom they would take to the derelict art-room, the cricket pavilion (a hairy boy called Jorge de Tormes was secretary to the First Eleven at that time), even the new chapel. That was discovered in flagrante and ended in a thrilling ceremony of expulsion. What must the Blessed Sacrament have thought, looking down on those moving buttocks in the aisle? It was surprising that so much was able to be got away with, considering how the Rector, Father Byrne, was so strong against sex. He would come round the dormitories some nights, smelling of neat J. J., feeling under the bedclothes for impure thoughts. On various occasions, having felt under the bedclothes with special lavishness, he would stand at the end of our dormitory to deliver a sermon on the evils of sex. He had a fine Irish instinct for the dramatic and, instead of turning on the lights, he would illuminate his ranting face with a pocket-torch, a decollated saint's head brave above a kind of hell-glow. One night he began with: 'This damnable sex, boys – ah, you do well to writhe in your beds at very mention of the word. All the evil of our modern times springs from unholy lust, the act of the dog and the bitch on the bouncing bed, limbs going like traction engines, the divine gift of articulate speech diminished to squeals and groans and pantings. It is terrible, terrible, an abomination before God and His Holy Mother. Lust is the fount of all other of the deadly sins, leading to pride of the flesh, covetousness of the flesh, anger in the thwarting of desire, gluttony to feed the spent body to be at it again, envy of the sexual prowess and sexual success of others, sloth to admit enervating day-dreams of lust. Only in the married state, by God's holy grace, is it sanctified, for then it becomes the means of begetting fresh souls for the peopling of the Kingdom of Heaven.'

He took a breath, and a voice from the dark took advantage of the breath to say: 'Mulligan begot a fresh soul and he wasn't married.' This was Roper, and what Roper said was true. Mulligan, long since expelled, had put a local girl in the family way; it was still well remembered.

'Who said that then?' called Father Byrne. 'What boy is talking after lights out?' And he machine-gunned the dark with his torch.

'Me,' said Roper stoutly. 'Sir,' he added. 'I only wanted to know,' he said, now illuminated. 'I don't see how an evil can be turned into a good by a ceremony. That would be like saying that the Devil can be turned into an angel again by just being blessed by a priest. I don't see it, sir.'

'Out, boy,' cried Father Byrne. 'Out of bed this instant.' His torch beckoned. 'You there at the end, turn on the lights.' Feet pattered and horrible raw yellow suddenly struck at our eyes. 'Now then,' cried Father Byrne to Roper, 'down on your knees, boy, and say a prayer for forgiveness. Who are you, worm, to doubt the omnipotence of Almighty God?'

'I wasn't doubting anything, sir,' said Roper, not yet out of bed. 'I was just interested in what you were saying, sir, even though it is a bit late.' And he thrust out a leg from the bed, as from a boat to test the temperature of the water.

'Out, boy,' shouted Father Byrne. 'Down on that floor and pray.'

'Pray for what, sir?' asked Roper, now standing, in faded blue shrunken pyjamas, between his bed and mine. 'For forgiveness because God's given me, in his infinite omnipotence, an enquiring mind?' He, like myself, was something over fifteen.

'No, boy,' said Father Byrne, with a swift Irish change to mellifluous quietness. 'Because you cast doubts on the miraculous, because you blasphemously suggest that God cannot' – crescendo – 'if He so wishes turn evil into good. Kneel, boy. Pray, boy.' (fff.)

'Why doesn't He then, sir?' asked Roper boldly, now down, though as if for an accolade, on his knees. 'Why can't we have what we all want – a universe that's really a unity?'

Ah, God help us, Roper and his unified universe. Father Byrne was now attacked by hiccups. He looked down sternly at Roper as though Roper, and not J. J., had brought them on. And then he looked up and round at us all. 'On your knees, all of you, hie,' he called. 'All of you, hie, pray. A spirit of evil stalks, hie, pardon, this dormitory.' So everybody got out of bed, all except one small boy who was asleep. 'Wake him, hie,' cried Father Byrne. 'Who is that boy there with no, hic, pyjama trousers? I can guess what you've been doing, boy. Hie'

'If somebody were to thump you on the back, ' said Roper kindly. 'Or nine sips of water, sir.'

'Almighty God,' began Father Byrne, 'Who knowest the secret thoughts of, hie, these boys' hearts-' And then he became aware of a certain element of unwilled irreverence, the hiccups breaking in like that. 'Pray on your own,' he cried. 'Get on with it.' And he hiccuped his way out. This was looked on as a sort of victory over authority for Roper.

He was having too many victories over authority, solely because of the exceptional gift of scientific enquiry he'd been demonstrating. I remember one fifth-form chemistry lesson in which Father Beauchamp, an English convert, had been dully revising the combining of elements into compounds. Roper suddenly asked: 'But why should sodium and chlorine want to combine to produce salt?'

The class laughed with pleasure at hope of a diversion. Father Beauchamp grinned sourly, saying, 'There can't be any question of wanting, Roper. Only animate things want.'

'I don't see that,' said Roper. 'Inanimate things must have wanted to become animate, otherwise life wouldn't have started on the earth. There must be a kind of free will in atoms.'

'Must there, Roper?' said Father Beauchamp. 'Aren't you rather tending to leave God out of the picture?'

'Oh, sir,' cried Roper impatiently, 'we ought not to bring God into a chemistry lesson.' Father Beauchamp chewed that for two seconds, then swallowed it. Tamely he said: 'You asked the question. See if you can answer it.'

I don't know when all this business of electrovalent methods of combination started, but Roper must, in those late nineteen-thirties, have known more than most schoolboys knew, and chemistry teachers for that matter. Not that Father Beauchamp knew much; he'd been learning the subject as he went along. What Roper said, I remember, was that the sodium atom had only one electron on its outer shell (nobody had ever taught us about outer shells) but that the chlorine atom had seven. A good stable number, he said, was eight and very popular with the constituents of matter. The two atoms, he said, deliberately came together to form a new substance with eight electrons on the outer shell. Then he said: 'They talk about holy numbers and whatnot – three and seven and nine and so on – but it looks as though eight is the really big number. What I mean is this: if you're going to bring God into chemistry, as you want to do, then eight must mean a lot to God. Take water, for instance, the substance that God made first, at least the Bible says about the spirit of God moving on the face of the waters. Well, you've got six outer electrons in the oxygen atom and only one in the hydrogen atom, and so you need two of those to one of oxygen to get water. God must have known all this, and yet you don't find eight being blown up as a big important number in the teachings of the Church. It's always the Holy Trinity and the Seven Deadly Sins and the Ten Commandments. Eight comes nowhere.'

'There are,' said Father Beauchamp, 'the Eight Beatitudes.' Then he had a brief session of lip-biting, not sure whether he ought to send Roper to the Rector for blasphemous talk. Anyway, he let Roper alone, and the rest of us for that matter, bidding us read up the stuff in our books. A twitch started in his right eye and he couldn't stop it. It was Father Byrne in the dormitory all over again. The sending of Roper to the Rector over God and Science was deferred till a year later, when Roper and I were in the Sixth Form, he inevitably doing science, myself languages. He told me all about it in the refectory afterwards. We were eating a very thin Irish stew. Roper kept his voice down – it was a rather harsh voice – and one lock of his lank straw hair languished in the steam from his plate.