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30 THE CAUSE AND THE CAUSER. the nectary is very narrow in one place. It is partially, blocked up by an overhanging protuberance on which the foreign bodies stand. A proboscis is very apt to hit it in dropping into the nectary. And when it is hit, some delicate' machinery is disturbed and cracked, and lets the" sticky balls of one if not both foreign bodies touch whatever is below: the proboscis in the case of a moth; the head in the case of a bee. If I were to touch it with my pincers the foreign bodies would adhere to them." Sir Helix. "How badly the flower must be constructed, doctor; we shall find the fault there, I believe." Dr. Earwig. "Excuse my repeating 'No' so often. But I must say it here. The flower is a masterpiece of ingenious contrivance." Sir Helix. "Is dropping the flower-dust receptacle which it wantsfor itself upon the heads of insects who don't want it and can make no use of it a proof thereof, eh, doctor ?" Dr. Earwig. Well really, yes. The insects don't want it for themselves certainly, but they