[De pollutionibus nocturnis]
This is a late fifteenth-century Latin treatise on nocturnal emissions, attributed to Jean Gerson and printed at Esslingen by Konrad Fyner around 1472 to 1488 for a clerical and scholarly readership. The only picture is a Boston Public Library ownership device: a laurel wreath enclosing a seated figure, a shield with an open book, two standing nude figures, the motto 'Lux Omnium Civium', and lettering reading 'Of the City of Boston'. A designer could take from it the classic symmetrical wreath-and-shield emblem structure, with balanced standing figures flanking a central crest.
![Picture 1 of 1 from [De pollutionibus nocturnis], leaf 2](https://img.insideoutlibrary.com/img/200/ia-depollutionibusn00gers-2-0.webp)