Dr. Zinchinelli, of Padua, in an essay on the "Reasons why People use the Right Hand in preference to the Left," will not allow custom or imitation to be the cause. He affirms that the left arm cannot be in violent and continued motion without causing pain in the left side, because there is the seat of the heart and of the arterial system; and that, therefore, nature herself compels man to make use of the right hand. _Earliest Traders._ The earliest record we have of nations trading with each other occurs in the Book of Genesis, when Joseph's brethren sold him to a caravan of Ishmaelites who were carrying spices, balm and myrrh into Egypt. The balm was from Gilead and the myrrh from Arabia. Thus commerce is of great antiquity. _The First Hermits._ The first hermit was Paul, of Thebes, in Egypt, who lived about the year 260; the second was Anthony, also of Egypt, who died in 345, at the age of 105. _The First Opera._ The first composer who tried his hand at setting an opera to music was Francisco Bamirino, an Italian artist. The piece to which he affixed the charms of a melodious accompaniment was "The Conversion of St. Paul," which was brought out at Rome in 1460. _The First Artificial Limb._ The first artificial limb on record is the iron hand of the German knight, Gotz Von Berlichingen, who flourished in the early part of the sixteenth century (1513), and who was named _The Iron-Handed_. The hand weighed three pounds, was so constructed as to grasp a sword or lance, and was invented by a mechanic at Nuremberg. It is preserved at Jaxthausen, near Heilbronn, and a duplicate of it is in the Castle of Erbach, in the Odenwald. _Kircher's Speaking-Trumpet._ "The Musurgia," printed in 1650, gives an account of a speaking-trumpet invented by Kircher. From a convent situated on the top of a mountain, he assembled twelve hundred persons to divine service, and read the litany to them through the trumpet, at a distance of from two to five Italian miles. Soon after a tube was made, according to Kircher's directions, by which words, without elevating the voice, could be understood from Ebersdorf to Neugeben. _Fish Market at Scarborough._ The fish market is held on the sands by the sides of the boats, which, at low water, are run upon wheels with a sail set, and are conducted by the fishermen, who dispose of their cargoes in the following manner: One of the female fishmongers inquires the price, and bids a groat; the fishermen ask a sum in the opposite extreme; the one bids up, and the other reduces the demand, till they meet at a reasonable point, when the bidder suddenly exclaims: "Het!" The purchase is afterwards retailed among the regular or occasional purchasers. _Few Fish Found at Sea._