Archibald R. Smith asks if there is a national flower, and if there is none, which is the favorite American flower? There is no national flower, and no pronouncedly favorite one. Efforts are always making to have a flower selected as the national one, but they meet with indifferent success. Everybody seems busy, and there is no authority competent to decide, save, perhaps, Congress, and that is busier than the rest of us. The golden-rod and the rose have, we believe, their partisans. Harry R. Harbeck, 183 Elm Street, Albany. N. Y., is interested in photography, and wants to hear from others who have amateur photographs of interesting spots near their homes. He has many good Albany views. Edward C. Wood, 156 School Lane, Germantown, Philadelphia, Pa., is well posted on the medals and souvenirs prepared to sell to visitors to the United States Mint in his city, and kindly offers to procure for members any of them at actual cost. There are fac-similes of the Liberty Bell and medals bearing the Lord's Prayer. Forest Gaines, 703 North State Street, Champaign, Ill., wants to buy Nos. 644 and 655, March 1 and May 17, 1892, HARPER'S YOUNG PEOPLE. T. J. Pleavin, 61 Bland Street, Alexandra Park, Manchester, England, wants to hear from members describing their home scenery, industries, and interests, and he promises to reply in the same line. E. Raymond Jefferis is informed that the Table has at present no badges in stock. If new ones are in hand in future, due notice will be given on this page. David Blondheim says he has read _Recreations in Botany_, recommended in the "Handy Book," and now asks for definitions of genus, family, species, and classes. Genus is a group, having so many points of structure in common that they receive a common name. A genus may not be the lowest group, for all the species of oak may form a single genus only. In the animal kingdom the lion, tiger, and leopard species form a single genus, namely, the cat. A family is a group of organisms, more comprehensive than the genus, because based on fewer points of likeness. A species is an ideal or single group that proceeds from a single ancestor, and reproduces itself in readily identified forms, as the dog, the rose. Classes are general divisions of things having general points in common, but capable of being subdivided into species, genus, and families. Suppose you write to the author, in care of the publishers, suggesting definitions of these terms in future editions.