Scientists prepared today for a mid‐course correction maneuver of the Viking 1, made necessary because of a helium leak aboard the spacecraft, which is rocketing toward Mars for a July 4 landing. The course change is scheduled for Tuesday. A spokesman for the Jet Propulsion Laboratory said Viking I was still expected to go into Mars orbit Saturday and begin surveying probable landing sites. Viking I to Get Route Shift

scientists present papers and hold discussions in gen area of physiochem hydrodynamics--arcane field of which Levich is considered founder (M) Western Scientists Protest to Soviet on Levich

scientists press efforts to determine whether nickel carbonyl precipitated outbreak; pathological findings described; med officials comment (L) New Pennsylvania Death Prompts Additional Tests

Scientists Produce Basic Food Factor B1 Artificially -- New Step in Hormones

Scientists Protest Killing of Pests Without Proof of Necessity.

Scientists Push Research to Enlarge a Market Already $15,938,000,000 a Year. RECENT GROWTH REVIEWED Big Expansion Noted in Aluminum, Molded Parts, Stainless Steel and Chromium Plate.