Picked warm from a tree, a California apricot opens into halves as easily as if it came with a dotted line down its center. The seed infuses the core with a hint of almond; the fruit carries the scent of citrus and jasmine; and it tastes, some say, like manna from heaven. In these pages, Robin Chapman recalls the season when the Santa Clara Valley was the largest apricot producer in the world and recounts the stories of Silicon Valley's now lost orchards...