Contends that although sonnet 108 is now considered to represent Sir Philip Sidney's final statement on the relationship of the two lovers, it remains largely ignored in most critical treatments of `Astrophil and Stella.' Need for a thorough understanding of its unique alchemical and emblematic imagery; Strong evocation of esoteric Renaissance science of alchemy; Sidney's reference to the `wretch'; Horizontal axis along which Stella's thoughts pass to Astrophil.