*2.2.6 Calorific values*

The calorific values are calculated by a calorimetric bomb Leco501–053 Acetanilide. These values obtained are also compared to other biomasses. The results are given in **Table 3**.

According to the results of the **Table 3**, the seeds of cistus and their shells present a better calorific value of 25.12 MJ.kg�<sup>1</sup> and 23.29 MJ.Kg�<sup>1</sup> respectively. To our knowledge it is the highest in comparison with other biomasses cited in the literature and which are presented in **Table 3**, therefore, the biomass used is a very good source of bio-oil or biofuels of second generation for a sustainable environment and economy.
