He taught her to read, and together they planned how the tulip bulbs should be brought to flower. One bulb Rosa was to plant, the second Van Baerle would cultivate in his cell with soil placed in an old water jug, and the third was to be kept in reserve.
Once more hope revived in Baerle's mind, but Rosa often suffered vexation because Cornelius thought more of his black tulip than of her.
In the meantime Boxtel, under the assumed name of Jacob Gisels, had made his way to Loewenstein in pursuit of the bulbs, and had ingratiated himself with Gryphus, offering to marry his daughter. Rosa's tulip had to be guarded from Gisels, who was always spying on her movements. She kept it in her room for safety, but Boxtel had a key made, and the day the tulip flowered, and arose a spotless black, he resolved to take it at once, and rush to Haarlem and claim the prize.
The day came. Rosa described to Cornelius the wonderful black tulip, and they drew up a letter to the president of the Horticultural Society at Haarlem, begging him to come and fetch the wonderful flower.
That very night while Cornelius and Rosa rejoiced as lovers--for now even Rosa was convinced of the prisoner's love for her--over the happiness of the flowering tulip, Boxtel crept into her room, and carried off the black tulip to Haarlem.
As for Van Baerle, he was beside himself with the rage of desperation when Rosa told him that the black tulip had been stolen. Rosa, bent on recovering the tulip, and certain in her own mind as to the thief, hastened away from Loewenstein the next day without a word, Gryphus was mad when he learnt his daughter was nowhere to be found, and put down the mysterious disappearance of Jacob Gisels and Rosa to the work of the devil, and was convinced that Van Baerle was the devil's agent.
The third day after the theft Gryphus, armed with a stick and a knife, attacked Cornelius, calling out, "Give me back my daughter." Cornelius got hold of the stick, forced Gryphus to drop the knife, and then proceeded to give the gaoler a thrashing. The noise brought in turnkeys and guards, who speedily carried off the wounded gaoler and arrested Van Baerle. To comfort the prisoner they assured him he would certainly be shot within twelve hours.
