A circular arrangement of 100 diatoms from Connecticut, USA. Prepared by Watson and Sons Ltd. Some crystals in the mountant, which has yellowed and receded/shrunk. Damage to the coverslip ring. One ‘wanderer’ although I am not sure where it has wandered from. Olympus BHB microscope using 450nm LED light. 10x Nikon Plan Apo NA 0.65 objective. Olympus Aplanat Achromat condenser, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 29 images stacked in Zerene (Pmax).