“…Considerable circumstantial evidence has been presented by previous investigators to incriminate both egg and contact transmission of lymphomatosis, Doyle (1927), Warrack and Dalling (1932), Biely et al (1932), Seagar (1933), Blakemore and Glover (1935), Gibbs (1936), Tower (1937), McClary and Upp (1939), and Lee and Wilcke (1941). Other investigators, Johnson (1932), and Pappenheimer et al (1926) obtained negative results with transmission by contact.…”