More than 20 works of art by the Glasgow Boys will come up at auction later this month and will be on show in the city this week.

The works, in oil, watercolour and pastel, will go on show in Glasgow before their sale at the Lyon & Turnbull auctioneers in Edinburgh on May 20.

The large collection of works includes paintings by the leading members of the seminal group of Glasgow artists, including Sir John Lavery, Edward Arthur Walton, George Henry and EA Hornel.

A recent exhibition, Pioneering Painters: The Glasgow Boys 1880-1900 at Kelvingrove Art Gallery and Museum in 2010, attracted more than 120,000 visitors as well as wide critical acclaim, and it subsequently toured to the Royal Academy of Arts in London.

The paintings will be on display to the public at the Royal Faculty of Procurators, Nelson Mandela Square, in Glasgow, this Thursday from 2pm to 5pm.

Nick Curnow, managing director and paintings specialist at Lyon & Turnbull, said: "The rise in interest in paintings by The Glasgow Boys has been incredible. The exhibitions in London at the Royal Academy and the Kelvingrove in Glasgow have certainly helped make them more popular."

The Schoolmates, by Walton, is being valued at between £40,000 and £60,000.

The sale also has two paintings by Sir John Lavery, including a piece from the Glasgow International Exhibition in 1888.

Lavery, an unofficial "artist-in-residence" at the exhibition, was on hand to record these events for posterity, and he painted the work in the sale Fireworks Over The Kelvin: Glasgow International Exhibition 1888, which is valued at up to £40,000.