English, c.1890, collection of 21 selenite images in black paper borders titles include Selenite Irregular, Quill, Mica Irregular, Mica Crossed, Sweep turned Baker, Mica Design Circular Polarization, Church Window with 12 untitled, including a bird, a window and a fruit basket, a delicately prepared selenite flower with the words Hearts Ease on a banner, a selenite in a wooden frame and another in a frame with label for 'Makers Newton London, Concave Selenite to show Newtons Rings'.

Provenance: The slides when purchased by the the current vendor came in a their original cardboard box labelled ' Professor Drummond London University Demonstration Slides for Polarization'. The slides remained in the Drummond family by descent until purchased by the current vendor.

Literature: Wright, Lewis, 1890, Optical Projection - A treatise on the Use of the Lantern in Exhibition and Scientific Demonstration Ch. 21, 22.