Cornelius uttered a cry, and was nearly fainting.

"Oh!" muttered he, "my God, my God, Thou dost reward me for my innocence and my captivity, as Thou hast allowed two such flowers to grow at the grated window of my prison!"

The tulip was beautiful, splendid, magnificent; its stem was more than eighteen inches high; it rose from out of four green leaves, which were as smooth and straight as iron lance-heads; the whole of the flower was as black and shining as jet.

"Rosa," said Cornelius, almost gasping, "Rosa, there is not one moment to lose in writing the letter."

"It is written, my dearest Cornelius," said Rosa.

"Is it, indeed?"

"Whilst the tulip opened I wrote it myself, for I did not wish to lose a moment. Here is the letter, and tell me whether you approve of it."

Cornelius took the letter, and read, in a handwriting which was much improved even since the last little note he had received from Rosa, as follows: --

"Mynheer President, -- The black tulip is about to open, perhaps in ten minutes. As soon as it is open, I shall send a messenger to you, with the request that you will come and fetch it in person from the fortress at Loewestein. I am the daughter of the jailer, Gryphus, almost as much of a captive as the prisoners of my father. I cannot, therefore, bring to you this wonderful flower. This is the reason why I beg you to come and fetch it it yourself.

"It is my wish that it should be called Rosa Barlaensis.

"It has opened; it is perfectly black; come, Mynheer President, come.

"I have the honour to be your humble servant,

"Rosa Gryphus.

"That's it, dear Rosa, that's it. Your letter is admirable! I could not have written it with such beautiful simplicity. You will give to the committee all the information that will be required of you. They will then know how the tulip has been grown, how much care and anxiety, and how many sleepless nights, it has cost. But for the present not a minute must be lost. The messenger! the messenger!"

"What's the name of the President?"

"Give me the letter, I will direct it. Oh, he is very well known: it is Mynheer van Systens, the burgomaster of Haarlem; give it to me, Rosa, give it to me."

And with a trembling hand Cornelius wrote the address, --

"To Mynheer Peter van Systens, Burgomaster, and President of the Horticultural Society of Haarlem."

"And now, Rosa, go, go," said Cornelius, "and let us implore the protection of God, who has so kindly watched over us until now."

And in fact the poor young people were in great need of protection.

They had never been so near the destruction of their hopes as at this moment, when they thought themselves certain of their fulfilment.

The reader cannot but have recognized in Jacob our old friend, or rather enemy, Isaac Boxtel, and has guessed, no doubt, that this worthy had followed from the Buytenhof to Loewestein the object of his love and the object of his hatred, -- the black tulip and Cornelius van Baerle.

What no one but a tulip-fancier, and an envious tulip-fancier, could have discovered, -- the existence of the bulbs and the endeavours of the prisoner, -- jealousy had enabled Boxtel, if not to discover, at least to guess.

I looked with interest upon this man, who was accused of being the perpetrator of a crime of violence. He was flaxen-haired and handsome, in a washed-out negative fashion, with frightened blue eyes, and a clean-shaven face, with a weak, sensitive mouth. His age may have been about twenty-seven, his dress and bearing that of a gentleman. From the pocket of his light summer overcoat protruded the bundle of endorsed papers which proclaimed his profession.

“We must use what time we have,” said Holmes. “Watson, would you have the kindness to take the paper and to read the paragraph in question?”

Underneath the vigorous headlines which our client had quoted, I read the following suggestive narrative:

“Late last night, or early this morning, an incident occurred at Lower Norwood which points, it is feared, to a serious crime. Mr. Jonas Oldacre is a well known resident of that suburb, where he has carried on his business as a builder for many years. Mr. Oldacre is a bachelor, fifty-two years of age, and lives in Deep Dene House, at the Sydenham end of the road of that name. He has had the reputation of being a man of eccentric habits, secretive and retiring. For some years he has practically withdrawn from the business, in which he is said to have massed considerable wealth. A small timber-yard still exists, however, at the back of the house, and last night, about twelve o’clock, an alarm was given that one of the stacks was on fire. The engines were soon upon the spot, but the dry wood burned with great fury, and it was impossible to arrest the conflagration until the stack had been entirely consumed. Up to this point the incident bore the appearance of an ordinary accident, but fresh indications seem to point to serious crime. Surprise was expressed at the absence of the master of the establishment from the scene of the fire, and an inquiry followed, which showed that he had disappeared from the house. An examination of his room revealed that the bed had not been slept in, that a safe which stood in it was open, that a number of important papers were scattered about the room, and finally, that there were signs of a murderous struggle, slight traces of blood being found within the room, and an oaken walking-stick, which also showed stains of blood upon the handle. It is known that Mr. Jonas Oldacre had received a late visitor in his bedroom upon that night, and the stick found has been identified as the property of this person, who is a young London solicitor named John Hector McFarlane, junior partner of Graham and McFarlane, of 426 Gresham Buildings. E. C. The police believe that they have evidence in their possession which supplies a very convincing motive for the crime, and altogether it cannot be doubted that sensational developments will follow.

“LATER. — It is rumoured as we go to press that Mr. John Hector McFarlane has actually been arrested on the charge of the murder of Mr. Jonas Oldacre. It is at least certain that a warrant has been issued. There have been further and sinister developments in the investigation at Norwood. Besides the signs of a struggle in the room of the unfortunate builder it is now known that the French windows of his bedroom (which is on the ground floor) were found to be open, that there were marks as if some bulky object had been dragged across to the wood-pile, and, finally, it is asserted that charred remains have been found among the charcoal ashes of the fire. The police theory is that a most sensational crime has been committed, that the victim was clubbed to death in his own bedroom, his papers rifled, and his dead body dragged across to the wood-stack, which was then ignited so as to hide all traces of the crime. The conduct of the criminal investigation has been left in the experienced hands of Inspector Lestrade, of Scotland Yard, who is following up the clues with his accustomed energy and sagacity.”