The document discusses the major and minor sources of revenue for the government. Major sources include taxes and prices, while minor sources are fees, special assessments, rates, fines, tributes, and indemnities. It then defines different types of taxes - direct and indirect taxes, proportional, progressive, regressive, and degressive taxes. It also defines prices, fees, special assessments, rates, fines, tributes, indemnities and other principles of taxation including equality, sacrifice, certainty, convenience, economy, fiscal adequacy, elasticity, flexibility, diversity, and neutrality.