National Geographic : 1937 Apr
Photograph by H. L. Shantz THE PLUMBING OF A CACTUS BECOMES ITS SKELETON Woody xylem tubes carry sap up living saguaros. When woodpeckers cut through the pipes detour channels are developed (page 530). The strong strands help to support the plants, which sometimes grow 50 feet tall and weigh 10 tons or more. Skeletons of dead cacti often stand upright for years. ©APfrom Pictures, Inc. SNOW ON A CACTUS, JUST ANOTHER OFNATURE'S TRICKS! Delighted by the heaviestsnowfall in35years, girls here inspect purplish flat lobed Opuntias, and find that little harm resulted from theflurry. The photo graph was taken January 8,1937, intheSaguaro National Monument, near Tucson.