There is, of course, that bright joyous blood that, when released by the cut of a scalpel or the headsman's axe, spurts out in regular impulses. This is the blood of happy thoughts and fine emotions, it is the blood of love and kindness. Then there is that darker sullen blood that flows without the vigour and the bounding joy of the other. This is the blood of anger and of sorrow, of melancholic thoughts and evil deeds.

  All these matters I have studied, and have filled one hundred papyrus rolls with my observations. There is no man in the world that I know of who has gone to such lengths, certainly none of those quacks in the temple with their amulets and their incantations have done so. I doubt any one of them could tell the liver from the sphincter of the anus without an invocation to Osiris, a casting of the divining dice and a fat fee paid in advance.

  In all modesty I can say that I have never met a man who understands the human body better than I, and yet the head is still a puzzle to me. Naturally I understand that the eyes see, the nose smells, the mouth tastes and the ears hear? but what is the purpose of that pale porridge that fills the gourd of the skull?

  I have never been able to fathom it myself, and no man has ever been able to offer me a satisfactory explanation, except that Tanus came closest to it. After he and I had spent an evening together sampling the latest vintage of red wine, he had woken in the dawn and suggested with a groan, 'Seth has placed this thing in our heads as his revenge on mankind.'

  I once met a man who was travelling with a caravan from beyond those legendary twin rivers, the Tigris and the Euphrates, who professed to have studied the same problem. He was a wise man and together we debated many mysteries over the course of half a year. At one point he suggested that all human emotion and thought sprang not from the heart, but from those soft amorphous curds that make up the brain. I mention this naive assertion only to demonstrate how gravely even an intelligent and learned man can err.

  Nobody who has ever considered that mighty organ, the heart, leaping with its own life in the centre of our body, fed by great rivers of blood, protected by the palisades of bone, can doubt that this is the fountain from which all thought and emotion springs. The heart uses the blood to disseminate these emotions throughout the body. Have you ever felt your heart stir within you and quicken to beautiful music, or a lovely face, or the fine words of a moving speech? Have you ever felt anything leaping around inside your head? Even the wise man from the East had to capitulate before my ruthless logic.

  No rational man can believe that a bloodless puddle of curdled milk lying inert in its bony jar could conjure up the lines of a poem or the design of a pyramid, could cause a man to love or to wage war. Even the embalmers scoop it out and discard it when they prepare a corpse for the long journey.

  There is, however, a paradox here in that if this glutinous mass is interfered with, even by the pressure of trapped fluid upon it, the patient is certainly doomed. It requires an intimate knowledge of the structure of the head and a quite marvellous dexterity to be able to drill through the skull without disturbing the sac that contains this porridge. I have both these attributes.

  As I ground down slowly through the bone, encouraged by Rasfer's bellows, I paused regularly to wash away the bone chips and filings by splashing vinegar into the wound. The sting of the liquid added little to the patient's well-being, but revived the flagging volume of his voice.

  Suddenly the sharp bronze drill bit cleanly through the skull, and a tiny but perfect circle of bone was blown out of the wound by the pressure within. It was followed immediately by a spurt of dark, clotted blood that hit me in the face. Immediately Rasfer relaxed under me. I knew, not without a sneaking pang of regret, that he would survive. As I stitched the flap of scalp back into place, covering the aperture in the depths of which the dura mater pulsed ominously, I wondered if I had truly done mankind a great service by preserving this specimen of it.

  When I left Rasfer with his head swathed in bandages, snoring and whimpering in porcine self-pity, I found that I was completely exhausted. The excitements and alarums of the day had expended even my vast store of energy. However, there was to be no rest for me yet, for my Lady Lostris' messenger still hovered on the terrace of my quarters and pounced on me as I set foot on the first step. I was allowed only sufficient grace to wash away Rasfer's blood and change my soiled raiment.

  As I tpttered into her chamber, barely able to place one . foot before the other, my Lady Lostris met me with blazing eyes and ominously tapping foot. 'Just where do you think you have been hiding yourself, Master Taita?' she lashed out at me immediately. 'I sent for you before the second watch, and it's now not much short of dawn. How dare you keep me waiting so? Sometimes you forget your station. You know full well the punishment for impertinent slaves?' She was in full flight, having let her impatience brew for all these hours. In anger her beauty is stunning, and when she stamped her foot in that adorable gesture that was so typically her own, I thought that my heart must burst with my love for her.

  'Don't you stand there grinning at me!' she flared at me. 'I am so truly angry that I could order you flogged.' She stamped her foot again, and I felt the tiredness fall from my shoulders like a heavy load. Her mere presence had the power to revitalize me.

  'My lady, what a wondrous role you played this night. It seemed to me and all who watched you that it was indeed the divine goddess that walked amongst us?'

  'Don't you dare try your tricks with me.' She stamped for the third time, but without conviction. 'You'll not wriggle out of this so easily?'

  'Truly, my lady, as I walked back from the temple through the crowded streets, your name was on every tongue. They said your singing was the finest they had ever heard, and had quite stolen every heart.'

  'I believe not a word,' she declared, but she was clearly having difficulty sustaining her fury. 'In fact I thought my voice was awful this evening. I was flat at least once, and off-key on numerous?'

  'I must contradict you, mistress. You were never better. And what beauty! It lit the whole temple.' She is not truly vain, my Lady Lostris, but she is a woman.

  'You awful man!' she cried in exasperation. 'I was ready to have you flogged this time, I truly was. But come and sit beside me on the bed and tell me all about it. I am still so excited that I am sure I will not sleep for a week.' She took my hand and led me to the bed, babbling on happily about Tanus, and how he must have won every heart as well as Pharaoh's with his wonderful performance and fearless speech, and how the infant Horus had beshat her dress, and did I truly think that she had sung even passing well, and wasn't I just saying so?

  At last I had to stop her. 'My lady, it is almost dawn and we must be ready to leave with all the court to accompany the king when he crosses the river to inspect his funerary temple and his tomb. You must get some sleep if you are to look your best on such an important state occasion.'

  'I'm not sleepy, Taita,' she protested, and went chattering on, only to slump against my shoulder a few minutes later, fallen asleep in mid-sentence.

  Gently, I slipped her head down on to the carved wooden headrest and covered her with a rug of colobus monkey furs. I could not bring myself to leave immediately but hovered beside her bed. At last I placed a gentle kiss upon her cheek. She did not open her eyes, but whispered sleepily, 'Do you think there will be an opportunity for me to speak to the king tomorrow? Only he will be able to prevent my father sending Tanus away.'