Margaret Wragg Sloss always liked to begin her lectures with a joke-like this one. "The city boy came to visit his country cousin and found him in the barn milking a big cow and holding the pail between his legs. 'Come in,' he said. 'Would you like to learn how to milk a cow? I'll show you.' The city boy hesitated, then replied, 'Gee, thanks, but could I start with a calf?"