[FIRST FOLDER]
Dialectics and Natural Science
[SECOND FOLDER]
The Investigation of Nature and Dialectics
1) Notes: a) On the Prototypes of the Mathematical
Infinite in the Real World b) On the "Mechanical" Conception of Nature c) On Nageli's Incapacity to Know the Infinite 2) Old Preface to [Anti]-Dühring. On Dialectics <3) Natural Science and the Spirit World> a
4) The Part Played by Labour in the Transition from Ape to Man <Basic Forms of Motion>a
5) Omitted from Feuerbach
TTHIRD FOLDER] Dialectics of Nature
1) Basic Forms of Motion 2) Two Measures of Motion 3) Electricity and Magnetism 4) Natural Science and the Spirit World 5) Old Introduction 6) Tidal Friction
[FOURTH FOLDER]
Mathematics and Natural Science. Miscellaneous FROM THE PREPARATORY MATERIALS
Endnotes
[312] The titles Engels gave to the four folders and the tables of contents of the second and third folders of material for Dialectics of Nature were not written before 1886, for the list of contents of the second folder includes the fragment "Omitted from Feuerbach", which was written in early 1886.