Again and again she returned to the attack. Could she but pierce the skin, her paralyzing venom would quickly do its work. Then the murderous task would be easy. Eggs would be laid deep in the wound; grubs would hatch from them, and batten luxuriously on their unwilling host, sapping his strength, but cunningly avoiding his vitals, until they were full-fed. As they turned to pupae he would die, and from caterpillar, or may be chrysalis, there would then issue, in place of gorgeous butterfly, a host of dingy hymenoptera. So would the race of ichneumons be preserved. The little Emperor was fat and well-liking--an ideal _creche_ for young ichneumons; but the little Emperor was very wide-awake. The fly could find no foothold on him. He flung his armed head backwards to his tail. He pawed the air with six fore feet. He shook himself in paroxysms of fury. The fly cared little for the latter, but the horns were hard and formidable. They covered his whole body with their sweep, and struck with lightning speed. At sundown she withdrew discomfited; the little Emperor's horns had served him well. His life was uneventful after this. When he had reached a length of two inches, his growth ceased. He fed less ravenously and less frequently. Three parts of his time he spent in contemplation of a special leaf. It was hard to tell wherein lay the fascination. He had spun a silken carpet on it. At rare intervals he tore himself away and snatched a hurried meal, but he infallibly returned to its friendly shelter. He rested on its mid-rib, facing the foot-stalk. His body was strongly arched and so compressed that the ridges of its crowded segments recalled the pile of velvet. His head and fore feet scarcely touched the surface. So he made ready for the second change. For this even the favourite leaf was discarded. He roamed about the tree for days, seeking one that would suit his purpose. At last he found one, hidden in a thick-set cluster. It hung free, but he secured it in such fashion to its stem that a stiff breeze could hardly shake it. He stretched silken ropes from its edges and passed them completely round the foot-stalk. Then, on its under surface, he spun a little boss of silk, gripped it with his hind-claspers, and swung with easy confidence head downwards. For three days he hung thus motionless, yet within him there was a lively motion. From the time he left the egg his life had been a dual one. The eye saw nothing but the outward mask, the caterpillar-form. Within this living vehicle that moved and spun and fed, lived the true butterfly--life within life, being within being. [Illustration: THE CROWDED SEGMENTS OF HIS BODY RECALLED THE PILE OF VELVET.]