The letters were among a collection loaned by Nussey to Bronte's biographer Elizabeth Gaskell in 1857.
BBC: Bronte letters returning to Haworth after ?185,000 sale
2.
Stephen Nussey, professor of Endocrinology at St Georges Hospital in London, explained that rickets is a severe aspect of vitamin D deficiency.
BBC: What is rickets?
3.
Twisted bones and bone degeneration are a feature of the disease and Professor Nussey said that it was only recognised in the early part of the 20th century.