Gillespie Graham, who is likely to have been assisted by Augustus Pugin. The school hall was designed by Donald Gow in 1893 and boasts a hammerbeam roof. A mezzanine floor was added later. The science block is by John Chesser (architect) and dates from 1887, incorporating part of the former primary school of 1838 by Alexander Black (architect). The chemistry block to the west of the site was designed by John Anderson in 1911. The grounds contain a selection of other buildings of varying age; these include a wing by inter-war school specialists Reid & Forbes, and a swimming pool, now unused. A 1922 granite war memorial, by James Dunn, is dedicated to the school's former pupils and teachers who died in World War I. Alumni and teachers who died in World War II were also added to the memorial. History 17th and 18th centuries On his death in 1624, George Heriot left just over 23,625 pounds sterling – equivalent to about £3 million in 2017 – to found a "hospital" (a charitable school) on the model of Christ's Hospital in London, to care for the "puir, faitherless bairns" (Scots: poor, fatherless children) and children of "decayit" (fallen on hard times) burgesses and freemen of Edinburgh. The construction of Heriot's Hospital (as it was first called) was begun in 1628, just outside the city walls of Edinburgh. It was completed in time to be occupied by Oliver Cromwell's English forces during the invasion of Scotland during the Third English Civil War. When the building was used as a barracks, Cromwell's forces stabled their horses in the chapel. The hospital opened in 1659, with thirty sickly children in residence. As its finances grew, it took in other pupils in addition to the orphans for whom it was intended. By the end of the 18th century, the Governors of the George Heriot's Trust had purchased the Barony of Broughton, thus acquiring extensive land for feuing (a form of leasehold) on the northern slope below James Craig's Georgian New Town. This and other land purchases beyond the original city boundary generated considerable revenue through leases for the Trust long after Heriot's death. 19th and 20th centuries In 1846 there was an insurrection in the Hospital and fifty-two boys were dismissed. This was the worst of several disturbances in the 1840s. Critics of hospital education blamed what they described as the monastic separation of