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A collection of more than 500 microscope specimen slides, mostly dating to the 19th century, will go under the hammer on July 12 at Toovey’s in Washington, West Sussex.

The slides are contained within 21 sliding drawers of a 17in (43cm) high Victorian mahogany slide cabinet, and cover biological, zoological, botanical, entomological and geological interests. The majority include paper labels for English optical instrument makers such as W Watson & Sons and Clarke & Page. 

Estimate £500-800.

tooveys.com

A watercolour of the Madonna by French Symbolist painter Edgard Maxence (1871-1954) is guided at £1000-1500 in the picture sale at Dreweatts on July 18 in Donnington Priory, Berkshire.

The 14½ x 11¼in (37 x 29cm) pencil and watercolour is signed and bears a label to the verso for Walker Bagshawe Fine Art, London dealer of British and European paintings.

Maxence’s work was influenced by the Pre-Raphaelites during the 19th century, and often depicted religious scenes with a focus on female subjects.

dreweatts.com