1. Introduction 2. The language of jets 3. The axioms on $\Gamma $ 4. The fundamental form 5. The structural equation 6. The second fundamental theorem 7. Pseudogroup structures 8. Deformations of $\Gamma $-structures 9. The Spencer sequence 10. An interpretation of the Spencer sequence in the special case of deformation theory 11 . Applications of the Spencer resolution to deformation theory 12. Further remarks on deformation theory 13. Almost structures 14. Elliptic pseudogroups, the flat case 15. Elliptic pseudogroups in general 16. The (second) Spencer sequence
