Lens on Leeuwenhoek

Which number?

Master list (pdf) of all 602 L-numbers, their Leeuwenhoek number, and their Collected Letters number

	location
Gates in Delft's Wall
Haagpoort and Wateringsepoort	in the city's wall, the northwest corner where the Vliet entered the city
Koepoort	in the city's east wall at the end of Vlamingstraat in the long stretch between the Haagpoort and the Oostpoort.
Oostpoort	in the city wall on the southeast corner at the end of the Oosteinde canal at the northern terminus of the Pijnackervaart.
Rotterdamse Poort and Schiedamse Poort	in the city's south wall near the southwest corner, where the Schie begins
Schoolpoort	in the west city wall just north of the Waterslootsepoort
Waterslootse Poort	The main gate in the city's west wall