[Footnote A:  The reader unaccustomed to microscopes may easily understand this by rolling a newspaper in the form of a tube and looking through it at a book, keeping the other eye open.]

Suddenly his attention drifted from one eye to the other.  The table-cloth was of the material called tapestry by shopmen, and rather brightly coloured.  The pattern was in gold, with a small amount of crimson and pale blue upon a greyish ground.  At one point the pattern seemed displaced, and there was a vibrating movement of the colours at this point.

Hapley suddenly moved his head back and looked with both eyes.  His mouth fell open with astonishment.

It was a large moth or butterfly; its wings spread in butterfly fashion!

It was strange it should be in the room at all, for the windows were closed.  Strange that it should not have attracted his attention when fluttering to its present position.  Strange that it should match the table-cloth.  Stranger far that to him, Hapley, the great entomologist, it was altogether unknown.  There was no delusion.  It was crawling slowly towards the foot of the lamp.

“Genus novo, by heavens!  And in England!” said Hapley, staring.

Then he suddenly thought of Pawkins.  Nothing would have maddened Pawkins more....  And Pawkins was dead!

Something about the head and body of the insect became singularly suggestive of Pawkins, just as the chess king had been.

“Confound Pawkins!” said Hapley.  “But I must catch this.”  And, looking round him for some means of capturing the moth, he rose slowly out of his chair.  Suddenly the insect rose, struck the edge of the lampshade—­Hapley heard the “ping”—­and vanished into the shadow.

In a moment Hapley had whipped off the shade, so that the whole room was illuminated.  The thing had disappeared, but soon his practised eye detected it upon the wall paper near the door.  He went towards it, poising the lamp-shade for capture.  Before he was within striking distance, however, it had risen and was fluttering round the room.  After the fashion of its kind, it flew with sudden starts and turns, seeming to vanish here and reappear there.  Once Hapley struck, and missed; then again.

The third time he hit his microscope.  The instrument swayed, struck and overturned the lamp, and fell noisily upon the floor.  The lamp turned over on the table and, very luckily, went out.  Hapley was left in the dark.  With a start he felt the strange moth blunder into his face.

It was maddening.  He had no lights.  If he opened the door of the room the thing would get away.  In the darkness he saw Pawkins quite distinctly laughing at him.  Pawkins had ever an oily laugh.  He swore furiously and stamped his foot on the floor.

There was a timid rapping at the door.

Then it opened, perhaps a foot, and very slowly.  The alarmed face of the landlady appeared behind a pink candle flame; she wore a night-cap over her grey hair and had some purple garment over her shoulders.  “What was that fearful smash?” she said.  “Has anything—­” The strange moth appeared fluttering about the chink of the door.  “Shut that door!” said Hapley, and suddenly rushed at her.