The days passed and Judson went about his work on the farm in a silent, mechanical kind of way, taking in the corn, digging the sweet potatoes and milking the black cow, while the old man stayed indoors away from the fierce African sun. Only in the late afternoon when the air began to get cool and sharp did he hobble outside, and always he went over to his black cow and spent an hour with it under the acacia tree. One day when he came out he found Judson standing beside the cow, regarding it strangely, standing in a peculiar attitude with one foot in front of the other and gently twisting his ear with his right hand.
‘What is it now?’ said the old man as he came limping up.
‘Cow won’t stop chewing,’ said Judson.
‘Chewing her cud,’ said the old man. ‘Leave her alone.’
Judson said, ‘It’s the noise, can’t you hear it? Crunchy noise like she was chewing pebbles, only she isn’t; she’s chewing grass and spit. Look at her, she goes on and on crunching, crunching, crunching, and it’s just grass and spit. Noise goes right into my head.’
‘Get out,’ said the old man. ‘Get out of my sight.’
At dawn the old man sat, as he always did, looking out of his window, watching Judson coming across from his hut to milk the cow. He saw him coming sleepily across the field, talking to himself as he walked, dragging his feet, making a dark-green trail in the wet grass, carrying in his hand the old four-gallon kerosene tin which he used as a milk pail. The sun was coming up over the escarpment and making long shadows behind the man, the cow and the little acacia tree. The old man saw Judson put down the tin and he saw him fetch the box from beside the acacia tree and settle himself upon it, ready for the milking. He saw him suddenly kneeling down, feeling the udder of the cow with his hands and at the same time the old man noticed from where he sat that the animal had no milk. He saw Judson get up and come walking fast towards the shack. He came and stood under the window where the old man was sitting and looked up.
‘Cow’s got no milk,’ he said.
The old man leaned through the open window, placing both his hands on the sill.
‘You lousy bastard, you’ve stole it.’
‘I didn’t take it,’ said Judson. ‘I bin asleep.’
‘You stole it.’ The old man was leaning farther out of the window, speaking quietly with one side of his mouth. ‘I’ll beat the hell out of you for this,’ he said.
Judson said, ‘Someone stole it in the night, a native, one of the Kikuyu. Or maybe she’s sick.’
It seemed to the old man that he was telling the truth. ‘We’ll see,’ he said, ‘if she milks this evening; and now for Christ’s sake, get out of my sight.’
By evening the cow had a full udder and the old man watched Judson draw two quarts of good thick milk from under her.
The next morning she was empty. In the evening she was full. On the third morning she was empty once more.
On the third night the old man went on watch. As soon as it began to get dark, he stationed himself at the open window with an old twelve-bore shot-gun lying on his lap, waiting for the thief who came and milked his cow in the night. At first it was pitch dark and he could not see the cow even, but soon a three-quarter moon came over the hills and it became light, almost as though it was daytime. But it was bitter cold because the Highlands are seven thousand feet up, and the old man shivered at his post and pulled his brown blanket closer around his shoulders. He could see the cow well now, just as well as in daylight, and the little acacia tree threw a deep shadow across the grass, for the moon was behind it.
All through the night the old man sat there watching the cow, and save when he got up once and hobbled back into the room to fetch another blanket, his eyes never left her. The cow stood placidly under the small tree, chewing her cud and gazing at the moon.
An hour before dawn her udder was full. The old man could see it; he had been watching it the whole time, and although he had not seen the movement of its swelling any more than one can see the movement of the hour hand of a watch, yet all the time he had been conscious of the filling as the milk came down. It was an hour before dawn. The moon was low, but the light had not gone. He could see the cow and the little tree and the greenness of the grass around the cow. Suddenly he jerked his head. He heard something. Surely that was a noise he heard. Yes, there it was again, a rustling in the grass right underneath the window where he was sitting. Quickly he pulled himself up and looked over the sill on to the ground.
Then he saw it. A large black snake, a mamba, eight feet long and as thick as a man’s arm, was gliding through the wet grass, heading straight for the cow and going fast. Its small pear-shaped head was raised slightly off the ground and the movement of its body against the wetness made a clear hissing sound like gas escaping from a jet. He raised his gun to shoot. Almost at once he lowered it again, why he did not know, and he sat there not moving, watching the mamba as it approached the cow, listening to the noise it made as it went, watching it come up close to the cow and waiting for it to strike.
But it did not strike. It lifted its head and for a moment let it sway gently back and forth; then it raised the front part of its black body into the air under the udder of the cow, gently took one of the thick teats into its mouth and began to drink.
The cow did not move. There was no noise anywhere, and the body of the mamba curved gracefully up from the ground and hung under the udder of the cow. Black snake and black cow were clearly visible out there in the moonlight.
For half an hour the old man watched the mamba taking the milk of the cow. He saw the gentle pulsing of its black body as it drew the liquid out of the udder and he saw it, after a time, change from one teat to another until at last there was no longer any milk left. Then the mamba gently lowered itself to the ground and slid back through the grass in the direction whence it came. Once more it made a clear hissing noise as it went, and once more it passed underneath the window where the old man sat, leaving a thin dark trail in the wet grass where it had gone. Then it disappeared behind the shack.
Slowly the moon went down behind the ridge of Mount Kenya. Almost at the same time the sun rose up out of the escarpment in the east and Judson came out of his hut with the four-gallon kerosene tin in his hand, walking sleepily towards the cow, dragging his feet in the heavy dew as he went. The old man watched him coming and waited. Judson bent down and felt the udder with his hand and, as he did so, the old man shouted at him. Judson jumped at the sound of the old man’s voice.
‘It’s gone again,’ said the old man.
Judson said, ‘Yes, cow’s empty.’
‘I think,’ said the old man slowly, ‘I think that it was a Kikuyu boy. I was dozing a bit and only woke up as he was making off. I couldn’t shoot because the cow was in the way. He made off behind the cow. I’ll wait for him tonight. I’ll get him tonight,’ he added.
Judson did not answer. He picked up his four-gallon tin and walked back to his hut.
That night the old man sat up again by the window watching the cow. For him there was this time a certain pleasure in the anticipation of what he was going to see. He knew that he would see the mamba again, but he wanted to make quite certain. And so, when the great black snake slid across the grass towards the cow an hour before sunrise, the old man leaned over the window sill and followed the movements of the mamba as it approached the cow. He saw it wait for a moment under the belly of the animal,
letting its head sway slowly backwards and forwards half a dozen times before finally raising its body from the ground to take the teat of the cow into its mouth. He saw it drink the milk for half an hour, until there was none left, and he saw it lower its body and slide smoothly back behind the shack whence it came. And while he watched these things, the old man began laughing quietly with one side of his mouth.