I. Principles of the Method 53
1. Objects of Investigation 53
2. Methods of Observing Dislocations by Electron Microscopy 54
3. Electron-microscope Images of Crystal Defects 55
4. Production of Diffraction Contrast 56
II. Principal Results 60
5. Movement of Dislocations 60
6. Interaction of Dislocations 64
7. Generation of Dislocations 68
8. Structure of Deformed Metal and Hardening 70
9. Dislocations and Point Defects 73
10. General and Specific Factors in the Structure of Thin Foils 74
Conclusion 76
References 76