1. Introduction  
2. The Investigated Sample  
3. Observations and Data Reduction  
4. Light-Curves  
5. Description of the Spectra  
6. Analysis and Discussion  
6.1. Extinction  
6.2. Accretion Luminosity and Mass Accretion Rate  
6.3. Physical Conditions of the H I Lines Emitting Region  
6.4. Mass Loss Variability and Forbidden Line Emission  
7. Conclusions