2 OBSERVATIONS  
2.1 Observational Set-up  
2.2 Data Reduction  
2.3 Redshift Determination and Object Classification  
2.4 Sub-Type Identification  
3 METHODS AND MEASUREMENTS  
3.1 Sample Selection  
3.2 Photometric Data and Host Galaxy Template Fitting  
3.3 Galaxy Subtraction Method  
3.4 Equivalent Width Measurements  
3.5 Evaluation of Additional Sources of Error  
4 LOW-Z COMPARISON SAMPLE  
4.1 Spectroscopy Sample  
4.2 Photometry Sample  
4.3 Low-z Equivalent Width Measurements and Errors  
4.4 Low-Redshift Trends  
5 RESULTS  
5.1 Comparison between High-z Data and Low-z Trends  
5.2 Correlations Between Spectroscopic and Photometric Properties  
5.3 Applications of SNe Ia Spectra in Cosmological Studies  
5.4 EW Si II as a Cosmological Calibrator  
6 DISCUSSION  
6.1 Tests for Evolution  
6.2 Implications for Cosmology  
6.3 Improvements