New Measurements of Nucleon Structure from HERMES

Recent measurements of the spin-dependent deep inelastic scattering structure functions of the nucleon g p;n 1 (x) are presented. Theoretical diiculties with the traditional separation of the total integral ? p;n of the structure functions into contributions from quark avours is discussed. Techniques using the measurements of semi-inclusive asymmetries that allow direct separation of the avour dependence of the nucleon spin are introduced, and preliminary data from the HERMES experiment are shown. Additional measurements of spin-independent nucleon structure currently under way at HERMES are presented.