Note 21 — CH. V. LANGLOIS & CH. SEIGNOBOS

M. Langlois wrote Book I., Book II. as far at Chapter VI., the second Appendix, and this Preface; M. Seignobos the end of Book II., Book III., and the first Appendix. Chapter I. in the second book, Chapter V. of the third book, and the Conclusion, were written in common.