A pathetic interest attaches to the large copper butterfly. This splendid species was first discovered in Wales by the celebrated botanist Hudson. It was subsequently captured in considerable numbers about Whittlesea Mere, in Huntingdonshire. Now, alas! it is extinct, and a specimen such as one possessed by Mr. Bignell is worth some pounds. The last secured was in 1847. Greedy collectors and dealers from London, after its discovery, were waiting for it, and offered the country yokels five shillings for every caterpillar secured. Now it is as extinct as the dodo and the great auk. There would seem to be no living creature that is not a home and feeding ground for parasites; even the butterflies are infested with them, and probably these parasites also have others infinitely small that attack them. Great fleas have little fleas upon their backs to bite 'em, And little fleas have lesser fleas--and so _ad infinitum_. One of the most interesting discoveries made by Mr. Bignell is that a creature like a scorpion--but all claw--that is found upon the common house-fly is not a true parasite. It likes a ride, and to do it cheap. And when a fly comes within reach, it lays hold of it with its disproportionately huge claws, clings, and has a ride, free, gratis and for nothing. When it has seen enough of the world and is tired, it lets go and drops off. Says Mr. Bignell: "The Blossom Underwing is a moth that was very abundant on the male flowers of the great sallow on April 13th, 1866. Previously this moth was very scarce; but on this night I saw at least a thousand; they were all in pairs, and each pair occupied a flower, a sight never to be forgotten. The fine flowering scrubby oaks were swarming with the larvæ. A friend of mine who kept birds in a very large cage, seeing the abundance of the caterpillars, decided to give his birds a treat; he accordingly gathered about a pint of them, carried them home, and instead of giving the birds two or three at a time, he incautiously put the tin into the cage and removed the lid. At once the caterpillars began to escape, and the seething mass of black and yellow wriggling over the floor, crawling about the wires, so frightened the birds that it caused the death of two of three, which beat themselves against the cage in vain hope to escape from these uncanny horrors."