- (pp. 1-22), which is sometimes designated De Utilitate Scientiarum, treats of the four offendicula, or causes of error.
- The offendicula have sometimes been looked upon as an anticipation of Francis Bacon's Idola, but the two classifications have little in common.
- 38 notes; especially for a comparison of the Idola with Roger Bacon's Offendicula.) N.