Correspondence re anti-vivisection movement Correspondence and papers re a Treasury enquiry into the claim of anti-vivisection societies to be regarded as charities for the purposes of income tax, prompted by a question tabled by Professor A V Hill in the House of Commons (1943); judgment of the House of Lords in re National Anti Vivisection Society v Commissioners of Inland Revenue (1947); copy of <i>The Animals' Defender</i>, August 1950 1936-1950