National Geographic : 1951 Jul
© National Geographic Society 102 Kodachromes by Luis Iarden A Silk Moth's Life, from Squirmy Caterpillar to Peanut-shaped Cocoon, Is a Glutton's Banquet ofMulberry Leaves Thousands of worms ravenously feeding sound like rustling rain. When just about to spin cocoons, the worms are killed and toughened by12hours' immersion in vinegar, salt, and water. Then they are torn open and the silk sacs removed and stretched. These silk-encasedpupas were spared tobecome breeding moths, which do no eating. Big peach-colored cocoons (upper center) indicate the Spanish gut breed. Gut worms spin larger, coarser cocoons than thread worms.