=How are Glaciers Formed? 324. How Large are Molecules? 324.= =PICTORIAL STORY OF THE FISHING INDUSTRY= =325= Episodes in the Game, 325. Modern Fishing Vessels, 326. The Trawl, 327. Drawing the Net, 328. Fish Curing, 329. Preparing for Market, 330. =THE STORY IN A BOX OF CALIFORNIA ORANGES= =331= Picked with Gloves, 331. Grading, 331. Shipped in Refrigerators, 333. =What Kind of Steel Knives do not Stain or Rust? 333. Why is it Necessary to Keep Quiet when Fishing? 333. First Apartment Houses in this Country, 336. Why do we Call 32° above Zero Freezing? 336. How is Fresco Painting Done? 336.= =THE STORY OF A PIECE OF CHEWING GUM= =337= Juice of the Chicle Tree, 337. Treatment in the Factory, 342. =Where did the Ferris Wheel get its Name? 342. What is Done to Keep Railroad Rails from Breaking? 342. How does a “Master Clock” Control others by Electricity? 342.= =THE STORY OF THE CALCULATING MACHINE= =345= How did Men Learn to Count? 345. The First Adding Machine, 345. The Slide Rule Principle, 348. The “Difference Engine,” 348. Present-Day Models, 349. The Largest Adding Machine, 354. How are Adding Machines Used? 355. =Where does Ermine Come from? 356. What is the Principle of “Foreign Exchange?” 356. What do We Mean by “The Old Moon in the New Moon’s Arms”? 356.= =THE STORY IN A BOWLING ALLEY= =357= Bowling Green, New York City, 357. How the Alley is Built, 358. Composition Balls, 361. =How are Artificial Precious Stones Made? 361. What is a Mexican Bull-Fight Like? 363. What is the Difference between “Alternating” and “Direct” Current? 363. What was the “Court of Love”? 363.= =THE STORY OF THE ADDRESSOGRAPH= =364= Birth of Mechanical Addressing, 364. The First Addressograph, 364. Greater Speed, 366. A Card Index that Addresses Itself, 367. =What is Dry Farming? 372. What is a Drying Machine Like? 372. How does the New York Stock Exchange Operate? 374. How did the term “Cowboys” Originate? 374.= =THE STORY IN A CHEMICAL FIRE EXTINGUISHER= =375= Smothering Fire with a Gas Blanket, 375. The Soda and Acid Extinguisher, 376. =How is Gold Leaf Made? 377. What is the Natural Color of Goldfish? 377. When was “Liquid Fire” first used in Warfare? 377. How did the Greyhound get his Name? 377. Why is It Called “Battery Park”? 379. How do we Know that the Earth is Round? 379. What were “Ducking Stools?” 379.= =THE STORY IN PHOTO-ENGRAVING= =380= Pictures are the Universal Language, 380. What a Halftone is, 380. Line Engravings, 381. Color Engraving, 382.