Happy 161st Birthday Julius Richard Petri from the State Library of NSW, 22 May 2013. Chemists making aspirin or the new penicillin? Format: Negative Notes: Find more detailed information about this photograph: acms.sl.nsw.gov.au/item/itemDetailPaged.aspx?itemID=13505 Search for more great images in the State Library's collections: acms.sl.nsw.gov.au/search/SimpleSearch.aspx From the collection of the State Library of New South Wales: www.sl.nsw.gov.au