1 INTRODUCTION  
2 OBSERVATIONS  
2.1 Starless vs. Protostellar Classification  
3 SPECTRAL ANALYSIS  
3.1 Velocity Centroid and Velocity Dispersion  
3.2 Source Size & Filling Fraction  
3.3 Column Densities  
4 RESULTS  
4.1 Abundance & Deuterium Ratio  
4.2 Comparisons with Mass and Radius  
4.3 Comparisons with Evolutionary Indicators  
4.4 Implications for Core Evolution  
5 CONCLUSIONS