Several geometric properties of Orlicz spaces are given. Among other things we prove that an N − function Φ satisfies the Δ 2 condition if and only if every non-reflexive subspace of L Φ (μ) contains a complemented copy of 1, if and only if L Φ (μ) enjoys the weak Radon-Nikodym property. We also prove that Φ ∊Δ2 if and only if every Asplund subspace of L Φ (μ) is reflexive.
