Copy letter from Herbert Rix, to Professor William Crawford Williamson In pursuance of his promise Rix sends both text and plates with the final numbering and paging. He asks that they not be kept longer than a day or two or the series of 'Philosophical Transactions [of The Royal Society]' wil be stopped and 'subsequent authors will be abusive.' He also encloses Williamson's old proof for comparison and two duplicate leaves with some slight suggestions by Dr Michael Foster which require attention. 2 October 1890