C. L. B. Beach, Hull, Iowa, wants to trade pressed flowers. He also wants specimens of the "fly-catcher" and of the "pitcher-plant." Andrew Neill: The numbers of HARPER'S YOUNG PEOPLE, November to April, and of HARPER'S ROUND TABLE, April 30th to the end of the year, will be bound into one volume, not two. Beginning with the change in form and name, pages containing advertisements will be bound into the volume, not cut out as formerly. Platinum and iridium are found in the Ural Mountains, in Brazil, California, and Ceylon. They are original or primary substances, not manufactures. Platinum is used in telegraph keys, and iridium, being very hard, for nibs in the ends of gold pens. Helen P. Hubbard: Common oyster-shells contain lime, nitrogen, iron, sulphur, manganese, magnesia, flour, bromine, phosphoric acid, and iodine, and, ground to a powder, were once used as medicine, since all of the substances are good for building up the system. Walter Henry, of Wisconsin, asks where he can procure silk-worm eggs. We think he can get them from the American Silk-Culture Association, Arch Street, Philadelphia, Pa., or from the Department of Agriculture, Washington, D.C. At any rate, both will be glad to give him information where he can get them. RICH TIMES. California was a rich spot for one to live in back in the fifties, or before then. The following account of nuggets of gold found in California in the old days, recently given by an authority, almost makes one wish that one had been living there at that time, although the hardships endured by the pioneer settlers were something which no amount of gold could compensate for. The largest mass of gold ever found in California was that dug out at Carson Hill, Calaveras County, in 1854. It weighed 195 pounds. Other lumps weighing several pounds were found at the same place. August 18, 1860, W. A. Farish and Harry Warner took from the Monumental Quartz Mines, Sierra County, a mass of gold and quartz weighing 133 pounds. It was sold to R. B. Woodward, of San Francisco, for $21,636.52. It was exhibited at Woodward's Gardens for some time, then was melted down. It yielded gold to the value of $17,654.94.