Abstract
1. Hydrogenated crude lecithin has an antigenic character.
2. Hydrogenated crude lecithin can be separated into the chloroform soluble portion and water soluble portion. The chlo-roform portion is entirely inactive as antigen, while the water soluble portion acts as antigen.
3. The water soluble portion contain proteic substance.
4. The water soluble proteic substance of crude lecithin is found to contain ovovitellin by immunological test. I wish to express my most sincere thanks to Professor S. Kakiuchi for his kind advice and encouragement in carrying out this investigation.
