1 2 3 4 1 _ _ _ _ 2 _ _ _ _ 3 _ _ _ _ 4 _ _ _ _ ACROSS 1) a waterproof raincoat made of rubberized fabric 2) chocolate cookie with white cream filling 3) a cylindrical tower used for storing silage 4) united states virologist who developed the ____ vaccine that is injected against poliomyelitis (born 1914) DOWN 1) tiny leafy-stemmed flowerless plants 2) an elaborate song for solo voice 3) any small compartment 4) someone regarded as eccentric or crazy and standing out from a group ** Scroll down for solution. ** Are you sure you want to peek? mack oreo silo salk