When the Swiss lawyer Albin Schram died in 2005, he left behind an extraordinary collection of letters by some of Western civilisation's greatest minds. They will soon go under the hammer - but here are the highlights of the collection.

Oscar Wilde's thankyou letter to Emily Wren, whose son Chrissie had sent a seasonal gift, dated 13 December 1888.

"I cannot tell you how charmed I am with Chrissie's present. It is a very sweet picture of him, and I prize it very much in memory of my little friend. I have considered it my duty to write him a letter expressing my gratitude... Give my regards to your husband."