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Four different soluble components of adenovirus type 9 (Rosen's group II) were identified. These were a complete hemagglutinin (HA), an incomplete HA, components carrying group-specific comple'ment-fixing (CF) antigen, and components identified only by their hemagglutination-inhibition (HI) antibody consuming capacity and antigen activity in CF tests with an antiserum against complete HA. The complete HA sedimented relatively rapidly. It was composed of 12 pentons (vertex capsomers plus projections) aggregated into the form of a pentagonal dodecahedron. The length of the projections was about 12 to 13 m,. Thus they appeared longer than the corresponding structures of types 3 and 11, but shorter than those of types 4 and 5. The rate of sedimentation of complete HA of type 9 was intermediate to those of the complete HA of types 3 and 11. The incomplete HA sedimented together with components carrying group-specific CF antigen, but could be separated from those by anion-exchange chromatography. Two different antigens were present in incomplete HA. One could absorb a group-specific hemagglutination-enhancing antibody, and was sensitive to treatment with trypsin. The other antigen could absorb the type-specific HI antibody and was not destroyed by trypsin. In addition to the incomplete HA, a separate population of more slowly sedimenting components showed a capacity to absorb HI antibody. These components could also be identified in CF tests when an antiserum against complete HA was applied. The incomplete HA, group-specific CF antigen, and slowly sedimenting HI antibody absorbing components are suggested to represent isolated penton, hexon, and fiber components, respectively.

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