In Derbyshire, among many other places, it is believed that the catching and killing of a robin, or taking the eggs from the nest, is sure to be followed by misfortune, such as the death of cattle, blight of corn, etc. The folks say— "Robins and wrens Are God's best cocks and hens. Martins and swallows Are God's best scholars." In Yorkshire, if a robin is killed, it is believed that the family cow will give bloody milk. _The Cuckoo._ A superstition prevails in Ireland, and in some parts of England, that any young person, on first hearing the cuckoo, will find a hair of the color of their sweetheart's adhering to their stocking, if they will at once take off their left shoe and examine it carefully. Gay, in his "Shepherd's Week," says— "Upon a rising bank I sat adown, Then doff'd my shoe, and, by my troth, I swear Therein I spied this yellow frizzled hair, As like to Lubberkin's in curl and hue As if upon his comely pate it grew." In Norfolk there is a belief that an unmarried person will remain single as many years as the cuckoo utters its call, when first heard in the spring. Subjoined is an old English invocation— "Cuckoo, cherry-tree, Good bird, tell me, How many years I have to live?" At the first call of the cuckoo the German peasant does the same thing as when he hears thunder for the first time in the year. He rolls himself two or three times on the grass, thinking himself thereby insured against pains in the back throughout the rest of the year, and all the more so if the bird continues its cry whilst he is on the ground. If the first note of the cuckoo comes upon you when you have no money in your pocket, it is held, both in Germany and England, to portend want of money throughout the year. A valuable virtue is attributed to cuckoos in keeping off fleas. In Hill's "Naturall and Artificiall Conclusions," (1650), we find: "A very easie and merry conceit to keep off fleas from your beds or chambers. Pliny reporteth that if, when you first hear the cuckow, you mark well where your first foot standeth, and take up that earth, the fleas will by no means breed where any of the same earth is thrown or scattered." This belief still exists in some parts of France. _Why the Cuckoo Builds no Nest._