Classicly

The money to found a British Museum was raised by a lottery in the middle of the last century. Sir Hans Sloane having offered his books and museum of natural history to Parliament, for less than half its value (20,000£.), it was purchased, together with the famous Harleian and Cottonian MSS., and deposited in Montague House, Bloomsbury, which had been bought of the Earl of Halifax, for the sum of 10,250£. Of the present British Museum this beginning forms a very insignificant part.