1. Introduction
2. The Taurus-Auriga Dark Young Stellar Association
3. Observations and Data Reduction
3.1. Photometry
3.2. Spectroscopy
4. Results of Spectroscopy
4.1. [O I] 63 µm Emission
4.2. [O I] 145 µm Emission
4.3. [C II] 158 µm Emission
4.4. Line Ratios
4.5. 63 µm Continuum Versus [O I] 63 µm Emission
5. Discussion
5.1. [O I] 63 µm Emission
5.2. What Can We Learn from the [O I] 63/145 Line Ratios?
5.3. Disk Mass Versus [O I] 63 µm Line Emission
5.4. Source of 63 µm Continuum Emission
5.5. Multiplicity
5.6. Class III Objects (Weak-line T Tauri Stars)
5.7. Comments on Individual Objects
6. Summary and Conclusions