Scientific and legal corres.

Including: RPL's ms, notes in preparation for meetings at I.C.I. lab. in Blackley, notes from those meetings, notes on the experimental work in progress at Imperial College, notes on methods of preparation of material, summaries of progress, notes from discussions with colleagues at Imperial College; agenda and minutes of meetings held between RPL and I.C.I. staff (many with RPL's amendments and additions); lists of compounds, requests for samples; notes prepared by Imperial College workers for RPL on results of laboratory experiments; notes and memos prepared by I.C.I. staff on the results and findings obtained; provisional specifications; patents entitled 'Improved process for the making of colouring matters', 'Tetra-aza-porphins and their intermediates'; typescript of 'Formation of tetrazaporphin pigments by reaction between two dissimilar imidines' on which patent specification was based.