I-block staging entry validated for model fit. Imported from staging batch duell-thimm-i, source entry 1102. Normalized as institutional or periodical material during bibliographic review.
Gelli's present witness shows that the preparatory instruction should be dated 1868 rather than the earlier local 1866 shell date. Gelli also notes that the work carries 20 figures.
The 1866 and 1868 Paris editions have been consolidated.