Late BulletinsTWIN FALLS, Ida., May 16 (UP) Senator D. Worth Clark, in a vigorous keynote speech at the Democratic nomination convention which opened here this afternoon, told delegates from over the state that if President Roosevelt wanted the third term nomination he shall have it by acclamation.ROME, May 16 (UP)An official spokesman tonight denied as baseless and tendencious reports in London that Italy had invaded Jugoslavia.BERNE, Switzrland, May 16 (UP) Switzerland prepared today for a German invasion that could come at any moment and without warning. At least 600,000 men one sixth of the population were under arms, civilians were evacuating the Rhineland frontier areas and the government moved to prevent fifth column activities.LONDON, May 16 (UP)Alfred Duff Cooper, minister of information, today broadcast a warning to the British public against rumors. It is better to get your information a few hours later and get the truth, he said, than to get it a few hours early and be either unduly depressed or unduly elated by news that subsequently turns out to be false. "LONDON, May 16 (UP)The war office announced tonight that 250,000 applications had been received, up to midnight last night in the call for special local defense volunteers to ward against parachutists and airplane-landed troops.