Archer felt bored
Meanwhile the two families had become interested in watching each other. When Jill had repulsed Jack, and he had moped about it awhile, he would begin staring at Arabella, over opposite, and trying to attract her attention. This got Jack in trouble all around. Arabella indignantly made faces at him and then turned her back; and as for Jill, she grew furious, and tore out his fur.
But in the next stage, they even stopped hating each other. Each pair grew indifferent.
Then the doctor put Jack in with Arabella, and Archer with Jill. Arabella promptly yielded to Jack. New devotion. More transports. Jill and Archer were shocked. Jill clung to the bars of her cage, quivering, and screaming remonstrance; and even blasé Archer chattered angrily at some of the scenes. Then the doctor hung curtains between the cages to shut out the view. Jill and Archer, left to each other, grew interested. They soon were inseparable.
The four monkeys, thus re-distributed, were now happy once more, and full of new liveliness and spirit. But before very long, each pair quarreled--and made up--and quarreled--and then grew indifferent, and had cynical thoughts about life.
At this point, the doctor put them back with their original mates.
And--they met with a rush! Gave cries of recognition and joy, like faithful souls reunited. And when they were tired, they affectionately curled up together; and hugged each other even at mealtime, and exchanged bits of food.
This was as far as the doctor had gotten, at the time that I met him; and as I have lost touch with him since, I don't know how things were afterward. His theory at the time was, that variety was good for fidelity.