56. How the cash register prevents dishonesty.
57. How a new fruit is produced—as seedless orange.
58. Mimeographing.
59. The value of Latin for scientific terms.
60. The value of certain birds, worms, insects.
61. The life history of some queer animal, or insect, or plant.
62. How accuracy is secured.
63. The human eye and the camera.
64. The fireless cooker.
65. Choose some half dozen terms from any trade or business and explain them. To sell short, margin, bull, bear, lamb. Proscenium, apron, flies, baby spot, strike. Fold in eggs, bring to a boil, simmer, percolate, to French. File, post, carry forward, remit, credit, receivership. Baste, hem, rip, overcast, box pleat, batik, Valenciennes.