Arbeitshypothesen sind revidierbar, deklarierten Wahrheiten nicht, sie
verkalken zum System; Arbeitshypothesen passen sich den Menschen an, den
deklarierten Wahrheiten wird der Mensch angepajJt; die ersten kann mann
verwerfen, von den anderen wird man verworfen. FRIEDRICH DORRBNMATI,
Nachgedanken Working hypotheses can be revised, ' declared truths
cannot-they calcify into dogma. Working hypotheses adapt to
people-people adapt to declared truths. One can reject the first but be
rejected by the latter. The concept of electron crystallography, i.e.,
the quantitative use of electron diffraction intensities to solve
crystal structures, is by no means new. Based on extensive pioneering
efforts on organic and inorganic substances, two major works on electron
diffraction structure analysis (or "electronography" as it was then
known in Moscow) appeared in English translation during the 19608. These
books are B. K. Vainshtein, Strukturnaya Elektronografiya (Structure
Analysis by Electron Diffrac- tion, translated by E. Feigl andJ. A.
Spink, Pergamon Press, Oxford, 1964), and B. B.