Plate A: Sediment (chiefly algae) from Cambridge Tap Water

2023-01-10T15:34:08-05:00

Illustrated plate depicting sediment (chiefly algae) from tap water collected on cotton disks in Cambridge, Massachusetts during the autumn of 1913. Per the author, the plate is intended to illustrate the variations in the appearance of the cotton after filtering samples of the Cambridge water collected on different days.