This dissertation is concerned with "ellipsis" constructions, that is, cases in which the redundant structure appears to be missing or unpronounced. After an introductory first chapter, chapter 2 discusses the semantics of German conditionals with elliptical consequents. Chapters 3 and 4 argue that certain asymmetric coordinations in English and German owe their asymmetry to the application of ellipsis. Chapter 5 presents evidence that some cases of "elided" verb phrases in English have the semantics of bound variables.