Lake tour results. All 1/100 dilutions. sterile tap water. Bacteria cell counts. Lakes include Bassenthwaite, Loughrigg, Elterwater, Haweswater, Ullswater, Thirlmere, Rydal, Grasmere, Tarn Hows, Derwentwater, Ennerdale, Crummock water, Buttermere, Brotherswater, Wastwater, Coniston.
Pre cultures and proportion of gram stains. Summary of growth on different media.
C. violaceum exps. including information on colour groupings (1956) in above lakes,innoculation details, strains of Chromobacterium violaceum.
Details on sodium thiosulphate solution and standard zinc solution