(1) The viability of neurotropic African horsesickness virus was tested in
media containing various salts, different amino acids, gelatine, "Dextran", chick
embryo extract, serum saline and egg white. Of these, egg white was the medium
of choice for retention of virus in a viable state.
(2) The virus of horsesickness showed distinct levels of stability in the various
media. The highest level of stability was found in suspensions containing 10 per
cent egg white, followed by 10 per cent serum saline and 5 per cent egg white
solutions. At a lower level of stability were suspensions made up in animo acids,
gelatine and embryo extract. A very low level of stability was shown by suspensions
of the virus in salt solutions and in solutions of "Dextran".