Series II contains the Experimental Station project files. These records are further divided into five sub-series. Sub-Series A, Pigments research, consists primarily of reports regarding the testing of pigments during the 1930s. Sub-Series B, the Research subject file, contains files relating to various aspects of pigments and rayon research, as well as materials developed for the building and construction trades. Sub-Series C, the Alphabetical project file, includes memoranda and correspondence regarding cellulose film, viscose rayon, physical research, exploratory research in inorganic chemistry, and nuclear chemistry. Sub-Series D, the Chronological file, contains memoranda and correspondence regarding ongoing research, as well as ideas and suggestions for possible areas of exploration. Sub-Series E contains files from Patterson's tenure with the Central Research Department's Physical and Analytical Division.