Further studies on the associative reactions of pneumonia virus of mice and influenza viruses; combination with various animal tissues and adsorbents.

Tissue particles from a wide variety of animal tissues possess the capacity to combine with PVM. Various adsorbents also combine with the virus. Elution of PVM from combination with either tissue particles or adsorbents can be achieved by appropriately altering the ionic environment. Influenza viruses also are adsorbed on and eluted from adsorbents under similar conditions. Reasons are presented for thinking that combination of PVM with tissue particles results from the action of adsorptive forces between virus and tissue particles.