Part 1 Conservation of Quantities and Invariance of Wholes; Chapter 1 Conservation of Continuous Quantities; Chapter 2 Conservation of Discontinuous Quantities and its Relation to One-One Correspondence1With the collaboration of M. Juan Jaen.; Part 2 Cardinal and Ordinal One-One Correspondence; Chapter 3 Provoked Correspondence and Equivalence of Corresponding Sets; Chapter 4 Spontaneous Correspondence Cardinal Value of Sets1With the collaboration of Mlle. Zoé Trampidis and Mme. Rafia Mehmed?emin.; Chapter 5 Seriation, Qualitative Similarity and Ordinal Correspondence; Chapter 6 Ordination and Cardination1In collaboration with Mlle Zahara Glikin.; Part 3 Additive and Multiplicative Compositions; Chapter 7 Additive Composition of Classes Relations between Class and Number; Chapter 8 Additive Composition of Numbers and Arithmetical Relations of Part to Whole1With the collaboration of Mme Tatiana-Katzaroff-Eynard and Mlle Zoé Trampidis.; Chapter 9 Co-Ordination of Relations of Equivalence and Multiplicative Composition of Numbers1With the collaboration of Mile Edith Vauthier.; Chapter 10 Additive and Multiplicative Composition of Relations and Equalization of Differences;