Washington: Smithsonian Institution 1950. Later printing. , 213-217 pages. 8vo. Original grey printed wrappers, minor soiling to the covers. Clean internally. Near Fine. Staplebound wraps. 
An offprint from the Smithsonian Report for 1949, pages 213-218. First printed in The Journal of the Franklin Institute Vol 246, No 6, December 1948. Originally a talk presented at the Medal Day Meeting at the Franklin Institute October 20, 1948. Smithsonian Publication 4002.
The Nobel Prize in Chemistry 1946 was divided, one half awarded to James Batcheller Sumner "for his discovery that enzymes can be crystallized", the other half jointly to John Howard Northrop and Wendell Meredith Stanley "for their preparation of enzymes and virus proteins in a pure form". (Nobelprize site)