The acting chief of medicine at Metropolitan Hospital was killed yesterday when strong winds uprooted a tree that crushed his car. Dr. John Corser was instantly killed, but somehow, his two children, ages 4 and 8, in the backseat were spared. A state police sergeant, James Kranik, explained, "The front limb of the tree, shaped in a V or a Y, landed directly on top of the driver. He was killed instantly. The rear limb......