1. INTRODUCTION

2. THE BASS SURVEY

3. OBSERVATIONS

4. SPECTRAL TYPES AND LOW-GRAVITY CLASSIFICATION

5. RESULTS
5.1. Updated YMG Membership
5.2. X-Ray Luminosity

6. DISCUSSION
6.2. An Updated Investigation on the Age Dependence of Spectroscopic Indices
6.3. Model Comparison
6.4. Space Density at the Deuterium-Burning Limit

7. SUMMARY AND CONCLUSIONS