This ignorance, however, is not altogether miserable. Out of it we get the constant pleasure of discovery. Every fact of nature comes to us each spring, if only we are sufficiently ignorant, with the dew still on it. If we have lived half a lifetime without having ever even seen a cuckoo, and know it only as a wandering voice, we are all the more delighted at the spectacle of its runaway flight as it hurries from wood to wood conscious of its crimes, and at the way in which it halts hawk-like in the wind, its long tail quivering, before it dares descend on a hill-side of fir-trees where avenging presences may lurk. It would be absurd to pretend that the naturalist does not also find pleasure in observing the life of the birds, but his is a steady pleasure, almost a sober and plodding occupation, compared to the morning enthusiasm of the man who sees a cuckoo for the first time, and, behold, the world is made new. And, as to that, the happiness even of the naturalist depends in some measure upon his ignorance, which still leaves him new worlds of this kind to conquer. He may have reached the very Z of knowledge in the books, but he still feels half ignorant until he has confirmed each bright particular with his eyes. He wishes with his own eyes to see the female cuckoo-rare spectacle!-as she lays her egg on the ground and takes it in her bill to the nest in which it is destined to breed infanticide. He would sit day after day with a field-glass against his eyes in order personally to endorse or refute the evidence suggesting that the cuckoo does lay on the ground and not in a nest. And, if he is so far fortunate as to discover this most secretive of birds in the very act of laying, there still remain for him other fields to conquer in a multitude of such disputed questions as whether the cuckoos egg is always of the same colour as the other eggs in the nest in which she abandons it. Assuredly the men of science have no reason as yet to weep over their lost ignorance. If they seem to know everything, it is only because you and I know almost nothing. There will always be a fortune of ignorance waiting for them under every fact they turn up. They will never know what song the Sirens sang to Ulysses any more than Sir Thomas Browne did.